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163 vulnerabilities by github
CVE-2026-75101 (GCVE-0-2026-75101)
Vulnerability from cvelistv5 – Published: 2026-09-22 20:43 – Updated: 2026-09-23 15:04
VLAI
EPSS
VEX
Title
Authorization bypass vulnerability in GitHub Enterprise Server allowed reading of private pull request diffs and patches via repository name collision
Summary
An authorization bypass vulnerability was identified in GitHub Enterprise Server that allowed any authenticated user of the instance to read the raw diff or patch of pull requests in private repositories without authorization. Access tokens for raw pull request diffs and patches were scoped to the repository name and pull request number rather than to a globally unique repository identifier, so an attacker who created a repository and pull request matching a target's repository name and pull request number could use a token for their own repository to retrieve the private pull request's contents. Exploitation required the attacker to know the target repository's name and a valid pull request number. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.21, 3.18.15, 3.19.12, 3.20.8, and 3.21.6. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 15:04 UTC
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
| https://docs.github.com/en/enterprise-server@3.21… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.17.0 , < 3.17.*
(semver)
Affected: 3.18.0 , < 3.18.* (semver) Affected: 3.19.0 , < 3.19.* (semver) Affected: 3.20.0 , < 3.20.* (semver) Affected: 3.21.0 , < 3.21.* (semver) |
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CVE-2026-77912 (GCVE-0-2026-77912)
Vulnerability from cvelistv5 – Published: 2026-09-22 20:43 – Updated: 2026-09-23 15:05
VLAI
EPSS
VEX
Title
Stored cross-site scripting vulnerability in GitHub Enterprise Server allowed HTML attribute injection via the Markdown rendering pipeline
Summary
A stored cross-site scripting (XSS) vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to inject arbitrary HTML attributes into rendered Markdown because the Markdown rendering pipeline rewrote quote characters in already-sanitized HTML without re-sanitizing the result. Crafted Markdown could abuse same-origin JavaScript gadgets to bypass Content Security Policy and gain control of the page DOM when viewed by another user. Successful exploitation could allow an attacker to read content visible to the victim, extract embedded CSRF tokens, perform state-changing actions as the victim, and exfiltrate data through same-origin writes. The payload could also propagate to repositories and organizations where the victim had write access. This vulnerability affected supported GitHub Enterprise Server releases in the 3.17, 3.18, 3.19, 3.20, 3.21, and 3.22 series and was fixed in versions 3.22.1, 3.21.6, 3.20.8, 3.19.12, 3.18.15, and 3.17.21. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 15:05 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
| https://docs.github.com/en/enterprise-server@3.21… | release-notes |
| https://docs.github.com/en/enterprise-server@3.22… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.17.0 , < 3.17.*
(semver)
Affected: 3.18.0 , < 3.18.* (semver) Affected: 3.19.0 , < 3.19.* (semver) Affected: 3.20.0 , < 3.20.* (semver) Affected: 3.21.0 , < 3.21.* (semver) Affected: 3.22.0 , < 3.22.* (semver) |
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CVE-2026-77987 (GCVE-0-2026-77987)
Vulnerability from cvelistv5 – Published: 2026-09-22 20:43 – Updated: 2026-09-23 15:26
VLAI
EPSS
VEX
Title
GitHub Enterprise Server notebook viewer vulnerable to Server-side request forgery
Summary
A server-side request forgery (SSRF) vulnerability was identified in the notebook viewer of GitHub Enterprise Server. The notebook viewer validated the scheme and host of a user-supplied URL but did not validate the port, allowing requests to be directed to internal services listening on other ports of the same appliance. Response bodies were not returned to the requester, but response timing acted as an oracle that allowed instance secrets to be extracted character by character. An extracted secret could then be used in a separate interaction with an internal service to obtain remote code execution on the appliance. Exploitation required network access to the instance and was unauthenticated when private mode was disabled, or required any authenticated user when private mode was enabled. This vulnerability affected GitHub Enterprise Server versions 3.17 through 3.22 and was fixed in versions 3.22.1, 3.21.6, 3.20.8, 3.19.12, 3.18.15, and 3.17.21. This vulnerability was reported through the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 15:26 UTC
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
| https://docs.github.com/en/enterprise-server@3.21… | release-notes |
| https://docs.github.com/en/enterprise-server@3.22… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.17.0 , < 3.17.*
(semver)
Affected: 3.18.0 , < 3.18.* (semver) Affected: 3.19.0 , < 3.19.* (semver) Affected: 3.20.0 , < 3.20.* (semver) Affected: 3.21.0 , < 3.21.* (semver) Affected: 3.22.0 , < 3.22.* (semver) |
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CVE-2026-76851 (GCVE-0-2026-76851)
Vulnerability from cvelistv5 – Published: 2026-09-01 21:55 – Updated: 2026-09-02 13:09
VLAI
EPSS
VEX
Title
Server-Side Request Forgery vulnerability in GitHub Enterprise Server allowed remote code execution via network access from pre-receive hooks to internal services
Summary
A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed remote code execution on the instance. Insufficient network isolation allowed malicious pre-receive hook code to impersonate an internal service and redirect trusted internal requests to a privileged service, leading to elevated code execution. Exploitation required pre-receive hook networking to be enabled and either site administrator privileges or write access to a repository containing a configured pre-receive hook. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.20, 3.18.14, 3.19.11, 3.20.7, and 3.21.5. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 13:09 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
| https://docs.github.com/en/enterprise-server@3.21… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.17.0 , ≤ 3.17.19
(semver)
Affected: 3.18.0 , ≤ 3.18.13 (semver) Affected: 3.19.0 , ≤ 3.19.10 (semver) Affected: 3.20.0 , ≤ 3.20.6 (semver) Affected: 3.21.0 , ≤ 3.21.4 (semver) Unaffected: 3.22.0 (semver) |
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CVE-2026-19118 (GCVE-0-2026-19118)
Vulnerability from cvelistv5 – Published: 2026-09-01 21:55 – Updated: 2026-09-02 14:11
VLAI
EPSS
VEX
Title
Race condition vulnerability was identified in GitHub Enterprise Server that allowed remote code execution
Summary
A time-of-check time-of-use race condition vulnerability was identified in GitHub Enterprise Server that allowed remote code execution. Exploitation required an authenticated user with write access to a repository and precise timing of concurrent upload requests. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.20, 3.18.14, 3.19.11, 3.20.7, and 3.21.5. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 13:09 UTC
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
| https://docs.github.com/en/enterprise-server@3.21… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.17.0 , ≤ 3.17.19
(semver)
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CVE-2026-18730 (GCVE-0-2026-18730)
Vulnerability from cvelistv5 – Published: 2026-09-01 21:54 – Updated: 2026-09-22 21:07
VLAI
EPSS
VEX
Title
Server-side request forgery vulnerability in GitHub Enterprise Server Manage API leaked a replayable gateway-agent bearer token
Summary
A server-side request forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to cause the Manage API to send crafted outbound requests to an attacker-controlled host. An unauthenticated endpoint parsed an attacker-supplied cluster configuration and issued gateway-to-agent requests whose HMAC authenticated only a timestamp, not the request path or body. An attacker positioned to intercept the outbound request could capture this token and replay it against privileged management agent endpoints. High-availability deployments were not affected due to a topology restriction. This vulnerability affected GitHub Enterprise Server releases in the 3.17, 3.18, 3.19, 3.20, and 3.21 series and was fixed in versions 3.17.21, 3.18.15, 3.19.12, 3.20.8, and 3.21.6. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 13:18 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
| https://docs.github.com/en/enterprise-server@3.21… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.17.0 , < 3.17.*
(semver)
Affected: 3.18.0 , < 3.18.* (semver) Affected: 3.19.0 , < 3.19.* (semver) Affected: 3.20.0 , < 3.20.* (semver) Affected: 3.21.0 , < 3.21.* (semver) |
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CVE-2026-18428 (GCVE-0-2026-18428)
Vulnerability from cvelistv5 – Published: 2026-08-13 17:32 – Updated: 2026-08-13 17:57
VLAI
EPSS
VEX
Title
SQL Query Validation Bypass in OpenSearch Direct Query
Summary
A SQL query validation bypass in the Flint extension query handler in the OpenSearch SQL plugin allows a remote authenticated actor with async query access to execute arbitrary code on Apache Spark workers by sending a crafted SQL query to the direct query endpoint.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 17:57 UTC
CWE
- CWE-693 - Protection Mechanism Failure
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://opensearch.org/artifacts/by-version/?_gl=… | patch |
| https://opensearch.org/artifacts/by-version/?_gl=… | patch |
| https://docs.aws.amazon.com/opensearch-service/la… | patchrelease-notes |
| https://github.com/opensearch-project/sql/securit… | release-notesvendor-advisory |
| https://aws.amazon.com/security/security-bulletin… | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| AWS | Opensearch |
Affected:
2.13 , ≤ 3.5
(custom)
cpe:2.3:a:aws:opensearch:*:*:*:*:*:*:*:* |
|
| Github | Opensearch |
Affected:
2.13 , ≤ 3.6
(custom)
cpe:2.3:a:github:opensearch:*:*:*:*:*:*:*:* |
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CVE-2026-18952 (GCVE-0-2026-18952)
Vulnerability from cvelistv5 – Published: 2026-08-12 18:42 – Updated: 2026-08-21 18:22
VLAI
EPSS
VEX
Title
Missing Input Validation in Threat Intel Feed Parser in OpenSearch Security Analytics Plugin
Summary
Missing input validation in the threat intelligence feed parser in the OpenSearch Security Analytics plugin might allow an authenticated remote user to perform server-side request forgery and read local files via a crafted URL parameter to the threat intel source configuration endpoint.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:51 UTC
CWE
- CWE-918 - Server-Side request forgery (SSRF)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://docs.aws.amazon.com/opensearch-service/la… | patch |
| https://aws.amazon.com/security/security-bulletin… | vendor-advisoryrelease-notes |
| https://github.com/opensearch-project/security-an… | release-notes |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| AWS | Opensearch |
Affected:
2.15.0 , < 3.5.0
(custom)
cpe:2.3:a:aws:opensearch:*:*:*:*:*:*:*:* |
|
| Github | Opensearch |
Affected:
2.15.0 , < 3.7.0
(custom)
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CVE-2026-19311 (GCVE-0-2026-19311)
Vulnerability from cvelistv5 – Published: 2026-08-12 18:34 – Updated: 2026-08-13 14:53
VLAI
EPSS
VEX
Title
Missing Authorization in Execute Monitor API in OpenSearch Alerting Plugin
Summary
Missing authorization in the Execute Monitor API in Amazon OpenSearch Alerting plugin might allow an authenticated remote user to read, modify, or delete arbitrary index data via a crafted inline monitor request with unintentional data source and input index parameters.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:52 UTC
CWE
- CWE-475 - Undefined behavior for input to API
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://aws.amazon.com/about-aws/whats-new/2026/0… | release-notes |
| https://github.com/opensearch-project/alerting/se… | release-notespatch |
| https://aws.amazon.com/security/security-bulletin… | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| AWS | OpenSearch |
Affected:
2.4 , ≤ 3.5
(custom)
cpe:2.3:a:aws:opensearch:*:*:*:*:*:*:*:* |
|
| Github | OpenSearch |
Affected:
2.4.0 , ≤ 2.19.5
(custom)
Affected: 3.0.0 , ≤ 3.7.0 (custom) cpe:2.3:a:github:opensearch:*:*:*:*:*:*:*:* cpe:2.3:a:github:opensearch:*:*:*:*:*:*:*:* |
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CVE-2026-15996 (GCVE-0-2026-15996)
Vulnerability from cvelistv5 – Published: 2026-08-05 20:12 – Updated: 2026-08-06 13:48
VLAI
EPSS
VEX
Title
Denial of service vulnerability in GitHub Enterprise Server allowed unauthenticated service disruption via deeply nested request parameters
Summary
A denial of service vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to cause excessive CPU consumption and exhaust the pool of request-handling worker processes by sending a crafted form-encoded HTTP POST request containing deeply nested parameters. Because request parameters were parsed before routing and authentication, any POST endpoint could be used to trigger the condition, which could render the instance unresponsive. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.3, 3.19.7, 3.18.10, and 3.17.16.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 13:48 UTC
CWE
- CWE-674 - Uncontrolled Recursion
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.17.0 , ≤ 3.17.15
(semver)
Affected: 3.18.0 , ≤ 3.18.9 (semver) Affected: 3.19.0 , ≤ 3.19.6 (semver) Affected: 3.20.0 , ≤ 3.20.2 (semver) |
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CVE-2026-17556 (GCVE-0-2026-17556)
Vulnerability from cvelistv5 – Published: 2026-08-05 20:05 – Updated: 2026-08-06 13:11
VLAI
EPSS
VEX
Title
Path traversal in GitHub Enterprise Server allowed unauthenticated deletion of instance storage via the X-GitHub-Request-Id header
Summary
A path traversal vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to delete arbitrary files and directories on the instance, including the entire user storage directory containing Git LFS objects, release assets, attachments, and avatars. The X-GitHub-Request-Id request header was used without sanitization as a filesystem path segment for the upload buffer directory, so a traversal value pointed the buffer at an arbitrary path and the deferred cleanup routine recursively removed the traversed target. Exploitation required only network reachability to the instance and no authentication, and it worked even when private mode was enabled. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.21.4, 3.20.6, 3.19.10, 3.18.13 and 3.17.19. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 13:10 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
| https://docs.github.com/en/enterprise-server@3.21… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.17.0 , ≤ 3.17.18
(semver)
Affected: 3.18.0 , ≤ 3.18.12 (semver) Affected: 3.19.0 , ≤ 3.19.9 (semver) Affected: 3.20.0 , ≤ 3.20.5 (semver) Affected: 3.21.0 , ≤ 3.21.3 (semver) |
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CVE-2026-47427 (GCVE-0-2026-47427)
Vulnerability from cvelistv5 – Published: 2026-07-28 15:32 – Updated: 2026-07-28 17:31
VLAI
EPSS
VEX
Title
GitHub MCP Server: Nil Pointer Dereference DoS in completion/complete Handler
Summary
GitHub MCP Server is GitHub's official MCP Server. Prior to 1.1.0, the CompletionsHandler function in pkg/github/server.go accesses params.Ref without first checking whether it is nil, so a completion/complete request with a missing or empty ref field triggers a nil pointer dereference and a Go runtime panic; because the crash occurs before any authentication or token validation, any unauthenticated client able to send JSON-RPC messages can crash the server, resulting in a complete denial of service. This issue is fixed in version 1.1.0.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 17:31 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/github/github-mcp-server/secur… | x_refsource_CONFIRM |
| https://github.com/github/github-mcp-server/pull/2502 | x_refsource_MISC |
| https://github.com/github/github-mcp-server/commi… | x_refsource_MISC |
| https://github.com/github/github-mcp-server/relea… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| github | github-mcp-server |
Affected:
< 1.1.0
|
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CVE-2026-54163 (GCVE-0-2026-54163)
Vulnerability from cvelistv5 – Published: 2026-07-17 20:19 – Updated: 2026-07-20 17:45
VLAI
EPSS
VEX
Title
secure_headers: CSP directive injection via sandbox, plugin_types, and report_to when given untrusted input
Summary
secure_headers manages application of security headers with many safe defaults. Prior to 7.3.0, secure_headers builds the Content-Security-Policy value by stitching directives with ; separators, and build_sandbox_list_directive, build_media_type_list_directive, and build_report_to_directive interpolate caller-supplied strings without scrubbing ;, \r, or \n. When untrusted input reaches SecureHeaders.override_content_security_policy_directives or append APIs for :sandbox, :plugin_types, or :report_to, an attacker can inject a CSP directive such as script-src 'unsafe-inline' * before the legitimate script-src, enabling XSS reachability through these sinks or CSP report exfiltration. This issue is fixed in version 7.3.0.
Severity
4.7 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 17:45 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/github/secure_headers/security… | x_refsource_CONFIRM |
| https://github.com/github/secure_headers/commit/2… | x_refsource_MISC |
| https://github.com/github/secure_headers/releases… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| github | secure_headers |
Affected:
< 7.3.0
|
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CVE-2026-15783 (GCVE-0-2026-15783)
Vulnerability from cvelistv5 – Published: 2026-07-17 15:20 – Updated: 2026-07-17 16:55
VLAI
EPSS
VEX
Title
Missing Authorization vulnerability was identified in GitHub Enterprise Server that allowed reading private repository metadata via delegated bypass rule suites
Summary
A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user with write access to any repository to read metadata from private repositories they did not have access to, including private repository owners and names, branch names, commit SHAs, commit messages, and the pushing actor. The delegated bypass endpoint resolved a rule suite directly from an attacker-supplied, encoded identifier without verifying that the requesting user could read the rule suite's repository, and because these identifiers are sequential an attacker could enumerate them across the instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.18, 3.18.12, 3.19.9, 3.20.5, and 3.21.3. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 16:54 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
| https://docs.github.com/en/enterprise-server@3.21… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.17.0 , ≤ 3.17.17
(semver)
Affected: 3.18.0 , ≤ 3.18.11 (semver) Affected: 3.19.0 , ≤ 3.19.8 (semver) Affected: 3.20.0 , ≤ 3.20.4 (semver) Affected: 3.21.0 , ≤ 3.21.2 (semver) |
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CVE-2026-15343 (GCVE-0-2026-15343)
Vulnerability from cvelistv5 – Published: 2026-07-17 15:18 – Updated: 2026-07-17 16:33
VLAI
EPSS
VEX
Title
Path traversal vulnerability in GitHub Enterprise Server allowed writing files to arbitrary repository paths, including GitHub Actions workflow files, via unchecked Dependabot dependency-file paths
Summary
A path traversal vulnerability was identified in GitHub Enterprise Server that allowed an attacker who had code execution inside the Dependabot updater container to write files to arbitrary repository paths, including GitHub Actions workflow files under .github/workflows/ as the path validation did not check the effective path which the attacker could control through the dependency file's directory and symlink target. If the repository used a pull_request_target workflow or had auto-merge enabled, an injected workflow could execute with access to the repository's GitHub Actions secrets. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.21.3, 3.20.5, 3.19.9, 3.18.12, 3.17.18.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 16:31 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
| https://docs.github.com/en/enterprise-server@3.21… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.17.0 , ≤ 3.17.17
(semver)
Affected: 3.18.0 , ≤ 3.18.11 (semver) Affected: 3.19.0 , ≤ 3.19.8 (semver) Affected: 3.20.0 , ≤ 3.20.4 (semver) Affected: 3.21.0 , ≤ 3.21.2 (semver) |
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CVE-2026-15007 (GCVE-0-2026-15007)
Vulnerability from cvelistv5 – Published: 2026-07-17 15:16 – Updated: 2026-07-17 16:39
VLAI
EPSS
VEX
Title
Denial of service vulnerability in GitHub Enterprise Server allowed service disruption via deeply nested YAML in release notes configuration
Summary
A denial of service vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user to cause service disruption by supplying a repository release notes configuration file containing deeply nested YAML. When release notes were generated, the configuration file was parsed without a nesting depth limit, causing excessive resource consumption that could render the instance unresponsive. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.18, 3.18.12, 3.19.9, 3.20.5, and 3.21.3. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 16:35 UTC
CWE
- CWE-770 - Allocation of resources without limits or throttling
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
| https://docs.github.com/en/enterprise-server@3.21… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.17.0 , ≤ 3.17.17
(semver)
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CVE-2026-14340 (GCVE-0-2026-14340)
Vulnerability from cvelistv5 – Published: 2026-07-01 21:03 – Updated: 2026-07-02 15:54
VLAI
EPSS
VEX
Title
An incorrect authorization vulnerability in GitHub Enterprise Server allows issue creation in unrelated public repositories
Summary
An incorrect authorization vulnerability was identified in GitHub Enterprise Server that allowed a user-to-server token scoped to a GitHub App installation to perform certain write operations on public repositories outside the token's intended scope. This was possible because the authorization check only verified that the installation had read permissions on the target repository rather than verifying that the token's installation was explicitly granted access to that repository. An attacker who obtained a victim's user-to-server token could create issues, issue comments, commit comments, and private vulnerability reports on any public repository, appearing as the victim user with no indication of the app involvement. This vulnerability was fixed by adding a repository scope check for user-to-server tokens issued by global apps. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.21.2, 3.20.4, 3.19.8, 3.18.11, 3.17.17, 3.16.20. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-02 15:10 UTC
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.16… | release-notes |
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
| https://docs.github.com/en/enterprise-server@3.21… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.16.0 , ≤ 3.16.19
(semver)
Affected: 3.17.0 , ≤ 3.17.16 (semver) Affected: 3.18.0 , ≤ 3.18.10 (semver) Affected: 3.19.0 , ≤ 3.19.7 (semver) Affected: 3.20.0 , ≤ 3.20.3 (semver) Affected: 3.21.0 , ≤ 3.21.1 (semver) |
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CVE-2026-10585 (GCVE-0-2026-10585)
Vulnerability from cvelistv5 – Published: 2026-06-30 21:39 – Updated: 2026-07-01 15:36
VLAI
EPSS
VEX
Title
Stored cross-site scripting vulnerability in GitHub Enterprise Server allowed arbitrary JavaScript execution via crafted Discussion titles in the Q&A category
Summary
A stored cross-site scripting vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to execute arbitrary JavaScript in another user's browser by injecting a crafted payload into the title of a Discussion in the Q&A category. The AnsweredQuestionStructuredDataComponent did not escape user-controlled Discussion titles before embedding them in a <script type="application/ld+json"> block, allowing the title to break out of the script context. The injection was escalated to a full cross-site scripting attack on GitHub Enterprise Server by leveraging JSONP callback support in the REST API to bypass the Content Security Policy. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.4, 3.19.8, 3.18.11, 3.17.17, 3.16.20. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-01 15:36 UTC
CWE
- CWE-79 - Improper neutralization of input during web page generation ('cross-site scripting')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.17.0 , ≤ 3.17.16
(semver)
Affected: 3.18.0 , ≤ 3.18.10 (semver) Affected: 3.19.0 , ≤ 3.19.7 (semver) Affected: 3.20.0 , ≤ 3.20.3 (semver) Affected: 3.16.0 , ≤ 3.16.19 (semver) |
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CVE-2026-9132 (GCVE-0-2026-9132)
Vulnerability from cvelistv5 – Published: 2026-06-30 20:23 – Updated: 2026-07-01 15:37
VLAI
EPSS
VEX
Title
Missing authorization vulnerability in GitHub Enterprise Server allowed disclosure of private repository contents via the Copilot pull request diff summary endpoint
Summary
A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user to read source code from private repositories they did not have access to. The
Copilot pull request description diff summary endpoint accepted a cross-repository comparison range and rendered the resulting diff without verifying that the requesting user was authorized to view
the target repository. Exploitation required an authenticated account on the instance with read access to at least one repository to use as the comparison base. This vulnerability affected all
versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.17.17, 3.18.11, 3.19.8, and 3.20.4. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-01 15:37 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.17.0 , ≤ 3.17.16
(semver)
Affected: 3.18.0 , ≤ 3.18.10 (semver) Affected: 3.19.0 , ≤ 3.19.7 (semver) Affected: 3.20.0 , ≤ 3.20.3 (semver) |
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CVE-2026-9106 (GCVE-0-2026-9106)
Vulnerability from cvelistv5 – Published: 2026-06-30 20:21 – Updated: 2026-07-01 15:37
VLAI
EPSS
VEX
Title
UI misrepresentation vulnerability in GitHub Enterprise Server allowed unauthorized organization runner management via undisclosed OAuth scope on consent screen
Summary
A UI misrepresentation vulnerability was identified in GitHub Enterprise Server that allowed an OAuth application to gain unintended access to an organization's runner management. An attacker could exploit this by creating an OAuth application requesting the manage_runners:org scope and directing a victim user to authorize it, as the scope was not displayed on the authorization consent screen. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.21.2, 3.20.4, 3.19.8, 3.18.11, 3.17.17, 3.16.20. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-01 15:37 UTC
CWE
- CWE-451 - User Interface (UI) Misrepresentation of Critical Information
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
| https://docs.github.com/en/enterprise-server@3.21… | release-notes |
| https://docs.github.com/en/enterprise-server@3.16… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.17.0 , ≤ 3.17.16
(semver)
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CVE-2026-48529 (GCVE-0-2026-48529)
Vulnerability from cvelistv5 – Published: 2026-06-26 16:33 – Updated: 2026-06-27 02:43
VLAI
EPSS
VEX
Title
GitHub MCP Server: Lockdown mode singleton in HTTP server causes cross-user GraphQL client confusion
Summary
GitHub MCP Server is GitHub's official MCP Server. From 0.22.0 until 1.1.2, when running in HTTP mode with --lockdown-mode enabled, the RepoAccessCache is implemented as a process-global singleton initialized with the first authenticated user's GraphQL client. All subsequent requests from different users share this singleton and their lockdown-related GraphQL queries are executed using the first user's credentials. The singleton is never updated to reflect later users' tokens. This vulnerability is fixed in 1.1.2.
Severity
6 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-27 02:42 UTC
CWE
- CWE-284 - Improper Access Control
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/github/github-mcp-server/secur… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| github | github-mcp-server |
Affected:
>= 0.22.0, < 1.1.2
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CVE-2026-9312 (GCVE-0-2026-9312)
Vulnerability from cvelistv5 – Published: 2026-05-27 00:02 – Updated: 2026-06-30 20:53
VLAI
EPSS
VEX
Title
Server-Side Request Forgery vulnerability in GitHub Enterprise Server allowed access to internal services via path traversal in upload endpoint
Summary
A server-side request forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to send crafted requests to internal services by exploiting insufficient input validation in an upload endpoint. By injecting path traversal content into request parameters, an attacker could bypass the intended request flow and redirect internal API calls, potentially accessing internal services and exposing sensitive credentials. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.17, 3.18.11, 3.19.8, 3.20.4, and 3.21.2. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-27 00:00 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
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| https://docs.github.com/en/enterprise-server@3.21… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
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| GitHub | Enterprise Server |
Affected:
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CVE-2026-8606 (GCVE-0-2026-8606)
Vulnerability from cvelistv5 – Published: 2026-05-26 23:59 – Updated: 2026-05-27 13:50
VLAI
EPSS
VEX
Title
Server-Side Request Forgery in GitHub Enterprise Server via Advisory Package URL Endpoint
Summary
A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an attacker to cause the server to issue HTTP requests to internal services via the security advisories package lookup feature. By directing requests to an internal management service and measuring response timing, an attacker could infer the values of sensitive environment variables, including signing secrets and private keys. Exploitation required GitHub Packages to be enabled; on instances not running in private mode the vulnerability was exploitable without authentication, otherwise any authenticated user could exploit it. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21.1 and was fixed in versions 3.20.3, 3.19.7, 3.18.10, 3.17.16, and 3.16.19. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-27 13:50 UTC
CWE
- CWE-918 - Server-Side request forgery (SSRF)
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.21… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.16… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.21.0 , < 3.21.1
(semver)
Affected: 3.20.0 , ≤ 3.20.2 (semver) Affected: 3.19.0 , ≤ 3.19.6 (semver) Affected: 3.18.0 , ≤ 3.18.9 (semver) Affected: 3.17.0 , ≤ 3.17.15 (semver) Affected: 3.16.0 , ≤ 3.16.18 (semver) |
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CVE-2026-45033 (GCVE-0-2026-45033)
Vulnerability from cvelistv5 – Published: 2026-05-13 15:45 – Updated: 2026-05-13 18:38
VLAI
EPSS
VEX
Title
GitHub Copilot CLI: Nested Bare Repository Can Execute Arbitrary Commands via core.fsmonitor
Summary
GitHub Copilot CLI brings AI-powered coding assistance directly to your command line. Prior to 1.0.43, a security vulnerability has been identified in GitHub Copilot CLI where a malicious bare git repository nested inside a project directory can achieve arbitrary code execution when the agent performs git operations. By exploiting git's automatic bare repository discovery during directory traversal, an attacker can set core.fsmonitor or other executable config keys to run arbitrary commands without user awareness or approval. The vulnerability arises because git's core.fsmonitor config key (and 15+ similar keys such as core.hookspath, diff.external, merge.tool, etc.) can specify arbitrary shell commands that git will execute as part of normal operations like status, diff, or rev-parse. This vulnerability is fixed in 1.0.43.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-13 18:38 UTC
CWE
- CWE-696 - Incorrect Behavior Order
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/github/copilot-cli/security/ad… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| github | copilot-cli |
Affected:
< 1.0.43
|
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CVE-2026-8106 (GCVE-0-2026-8106)
Vulnerability from cvelistv5 – Published: 2026-05-07 21:18 – Updated: 2026-05-08 13:07
VLAI
EPSS
VEX
Title
Reflected HTML injection vulnerability in GitHub Enterprise Server Management Console login page allowed credential theft
Summary
A reflected HTML injection vulnerability was identified in the GitHub Enterprise Server Management Console login page that could allow credential theft. The redirect_to query parameter on the /setup/unlock endpoint was reflected into an HTML attribute without proper sanitization, enabling an attacker to inject a form element that could capture administrator credentials. Exploitation required an administrator to click a crafted link and enter their credentials. This vulnerability affected GitHub Enterprise Server versions 3.19.1 through 3.19.5 and 3.20.0 through 3.20.1, and was fixed in versions 3.19.6 and 3.20.2. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-08 13:07 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.19.1 , ≤ 3.19.5
(semver)
Affected: 3.20.0 , ≤ 3.20.1 (semver) Unaffected: 3.19.0 (semver) Unaffected: 3.21.0 (semver) |
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CVE-2026-8034 (GCVE-0-2026-8034)
Vulnerability from cvelistv5 – Published: 2026-05-07 21:18 – Updated: 2026-05-08 13:03
VLAI
EPSS
VEX
Title
Server-side request forgery vulnerability in GitHub Enterprise Server notebook viewer via URL parser confusion
Summary
A server-side request forgery (SSRF) vulnerability was identified in the GitHub Enterprise Server notebook viewer that allowed an attacker to access internal services by exploiting URL parser confusion between the validation layer and the HTTP request library. The hostname validation used a different URL parser than the request library, enabling a crafted URL to pass validation while directing the request to an unintended host. Exploitation required network access to the GitHub Enterprise Server instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.16.18, 3.17.15, 3.18.9, 3.19.6, and 3.20.2. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-08 13:02 UTC
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.16… | release-notes |
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.16.0 , ≤ 3.16.17
(semver)
Affected: 3.17.0 , ≤ 3.17.14 (semver) Affected: 3.18.0 , ≤ 3.18.8 (semver) Affected: 3.19.0 , ≤ 3.19.5 (semver) Affected: 3.20.0 , ≤ 3.20.1 (semver) Unaffected: 3.21.0 (semver) |
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CVE-2026-7541 (GCVE-0-2026-7541)
Vulnerability from cvelistv5 – Published: 2026-05-07 21:18 – Updated: 2026-05-08 13:44
VLAI
EPSS
VEX
Title
Denial of service vulnerability in GitHub Enterprise Server allowed service disruption via unauthenticated API endpoint
Summary
A denial of service vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to cause service disruption by sending crafted requests with deeply nested JSON payloads to an unauthenticated API endpoint. The endpoint parsed user-controlled JSON request bodies without size or depth limits, causing excessive CPU and memory consumption. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.2, 3.19.6, 3.18.9, 3.17.15, and 3.16.18. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-08 13:44 UTC
CWE
- CWE-770 - Allocation of resources without limits or throttling
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.16… | release-notes |
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.16.0 , ≤ 3.16.17
(semver)
Affected: 3.17.0 , ≤ 3.17.14 (semver) Affected: 3.18.0 , ≤ 3.18.8 (semver) Affected: 3.19.0 , ≤ 3.19.5 (semver) Affected: 3.20.0 , ≤ 3.20.1 (semver) |
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CVE-2026-6736 (GCVE-0-2026-6736)
Vulnerability from cvelistv5 – Published: 2026-05-07 21:14 – Updated: 2026-05-08 13:57
VLAI
EPSS
VEX
Title
Authentication bypass vulnerability in GitHub Enterprise Server allowed creation of local user accounts bypassing the configured external identity provider
Summary
An authentication bypass vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to create a local user account, bypassing the configured external identity provider. When external authentication was enabled, the signup endpoint did not properly enforce the authentication restriction, allowing account creation and session establishment without identity provider validation. The created account was limited to the default base permissions configured on the instance. Exploitation required network access to a GHES instance configured with an external authentication provider. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.2, 3.19.6, 3.18.9, 3.17.15, and 3.16.18.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-08 13:57 UTC
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@3.16… | release-notes |
| https://docs.github.com/en/enterprise-server@3.17… | release-notes |
| https://docs.github.com/en/enterprise-server@3.18… | release-notes |
| https://docs.github.com/en/enterprise-server@3.19… | release-notes |
| https://docs.github.com/en/enterprise-server@3.20… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.16.0 , ≤ 3.16.17
(semver)
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CVE-2026-5845 (GCVE-0-2026-5845)
Vulnerability from cvelistv5 – Published: 2026-04-21 22:42 – Updated: 2026-04-22 18:04
VLAI
EPSS
VEX
Title
Improper authorization fallback allows scoped user-to-server token installation escape in GitHub Enterprise Server
Summary
An improper authorization vulnerability in scoped user-to-server (ghu_) token authorization in GitHub Enterprise Server allows an authenticated attacker to access private repositories outside the intended installation scope, which can include write operations, via an authorization fallback that treated a revoked/deleted installation as a global installation context, which could be chained with token revocation timing and SSH push attribution to obtain and reuse a victim-scoped token. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, and 3.14.26. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-22 18:03 UTC
CWE
- CWE-639 - Authorization bypass through User-Controlled key
Assigner
References
7 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.20.0 , < 3.20.1
(semver)
Affected: 3.19.0 , ≤ 3.19.4 (semver) Affected: 3.18.0 , ≤ 3.18.7 (semver) Affected: 3.17.0 , ≤ 3.17.13 (semver) Affected: 3.16.0 , ≤ 3.16.16 (semver) Affected: 3.15.0 , ≤ 3.15.20 (semver) Affected: 3.14.0 , ≤ 3.14.25 (semver) |
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CVE-2026-3307 (GCVE-0-2026-3307)
Vulnerability from cvelistv5 – Published: 2026-04-21 22:23 – Updated: 2026-04-22 18:00
VLAI
EPSS
VEX
Title
Authorization bypass in GitHub Enterprise Server secret scanning push protection allows cross-repository modification of delegated bypass reviewers
Summary
An authorization bypass vulnerability was identified in GitHub Enterprise Server that allowed an attacker with admin access on one repository to modify the secret scanning push protection delegated bypass reviewer list on another repository by manipulating the owner_id parameter in the request body. Authorization was verified against the repository in the URL, but the action was applied to a different repository specified in the request body. The impact is limited to assigning existing trusted users as bypass reviewers; it does not allow adding arbitrary external users. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.14.25, 3.15.20, 3.16.16, 3.17.13, 3.18.7, 3.19.4 and 3.20.1. This vulnerability was reported via the GitHub Bug Bounty program.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-22 17:59 UTC
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
7 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GitHub | Enterprise Server |
Affected:
3.14.0 , ≤ 3.14.24
(semver)
Affected: 3.15.0 , ≤ 3.15.19 (semver) Affected: 3.16.0 , ≤ 3.16.15 (semver) Affected: 3.17.0 , ≤ 3.17.12 (semver) Affected: 3.18.0 , ≤ 3.18.6 (semver) Affected: 3.19.0 , ≤ 3.19.3 (semver) Affected: 3.20 , ≤ 3.20.0 (semver) |
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