Vulnerability-Lookup

GHSA-4G8M-XFV2-JHR3

Vulnerability from github – Published: 2026-10-02 18:31 – Updated: 2026-10-02 18:31

Details

Preconditions:

A linked/remote MISP server is configured and connected to the local instance.
The linked server supplies a crafted tag ID in an event.
An authenticated user views the event preview and interacts with the affected tag element.

Impact:

Arbitrary JavaScript execution in the context of the viewing user's browser session, potentially allowing session hijacking, data exfiltration, or unauthorized actions on behalf of the user.

Affected versions: MISP prior to the fix commit (v2.5.48 or later, exact boundary unconfirmed).

Severity

4.8 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-104907"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-02T16:16:48Z",
    "severity": "MODERATE"
  },
  "details": "MISP contains a cross-site scripting (XSS) vulnerability in the remote event preview page. When a linked (remote) MISP server is configured, the event preview renders tag identifiers inside an inline JavaScript onclick attribute. The tag ID value was HTML-escaped but not sanitized for the JavaScript string context, meaning a malicious linked server could supply a tag ID containing characters (such as a single quote) that break out of the JavaScript string literal and inject arbitrary script.\n\nPreconditions:\n\n- A linked/remote MISP server is configured and connected to the local instance.\n\n- The linked server supplies a crafted tag ID in an event.\n\n- An authenticated user views the event preview and interacts with the affected tag element.\n\nImpact:\n\n- Arbitrary JavaScript execution in the context of the viewing user\u0027s browser session, potentially allowing session hijacking, data exfiltration, or unauthorized actions on behalf of the user.\n\nAffected versions: MISP prior to the fix commit (v2.5.48 or later, exact boundary unconfirmed).",
  "id": "GHSA-4g8m-xfv2-jhr3",
  "modified": "2026-10-02T18:31:27Z",
  "published": "2026-10-02T18:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-104907"
    },
    {
      "type": "WEB",
      "url": "https://github.com/MISP/MISP/commit/70ad174dd"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-104907 (GCVE-0-2026-104907)

Vulnerability from cvelistv5 – Published: 2026-10-02 15:51 – Updated: 2026-10-02 16:18

Title

MISP: JavaScript Injection via Remote Tag ID in Event Preview Inline Handler

Summary

MISP contains a cross-site scripting (XSS) vulnerability in the remote event preview page. When a linked (remote) MISP server is configured, the event preview renders tag identifiers inside an inline JavaScript onclick attribute. The tag ID value was HTML-escaped but not sanitized for the JavaScript string context, meaning a malicious linked server could supply a tag ID containing characters (such as a single quote) that break out of the JavaScript string literal and inject arbitrary script. Preconditions: - A linked/remote MISP server is configured and connected to the local instance. - The linked server supplies a crafted tag ID in an event. - An authenticated user views the event preview and interacts with the affected tag element. Impact: - Arbitrary JavaScript execution in the context of the viewing user's browser session, potentially allowing session hijacking, data exfiltration, or unauthorized actions on behalf of the user. Affected versions: MISP prior to the fix commit (v2.5.48 or later, exact boundary unconfirmed).

Severity

4.8 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

Supplier · CIRCL (v2.0.3)

Decision recorded 2026-10-02 15:50 UTC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-02 16:17 UTC

CWE

CWE-79 - Cross-site Scripting (XSS)
CWE-116 - Improper Encoding or Escaping of Output

Assigner

CIRCL ENISA root

References

1 reference

URL	Tags
https://github.com/MISP/MISP/commit/70ad174dd	patch

Impacted products

1 product

Vendor	Product	Version
MISP	MISP	Affected: 0 , < 2.5.48 (semver) cpe:2.3:a:misp:misp::::::::

Credits

Jeroen Pinoy iglocska Claude Opus 5.5 (1M context)

GCVE extensions

AI-generated Human-reviewed Confidence: medium Model qwen3.8:27b advisory bcp-05-x-01bcp-05-x-02bcp-05-x-03

AI involvement GCVE-BCP-05-X-01

Whole record AI-generated Human-reviewed GNA-1

Draft vulnerability metadata was generated from a git-format patch using an Ollama-hosted language model. Human validation is required before publication.

ai-computer-assisted:llm-generatedai-computer-assisted:classification

Model	Source	Identifier
qwen3.8:27b	ollama	`qwen3.8:27b`

Patch provenance GCVE-BCP-05-X-02

Generator: patch2vuln.py on 2026-10-02 15:50
Model: qwen3.8:27b
Input: https://github.com/MISP/MISP/commit/70ad174dd.patch 048909e6f2d9…
Confidence: medium

Commit	Subject	Patch SHA-256
`70ad174ddd43`	fix: [security] Cast the remote tag id in the event preview	`048909e6f2d9…`

Fix summary

The vulnerability is remediated by casting the remote tag ID to an integer before embedding it in the inline JavaScript onclick handler. This ensures only a numeric value is rendered, eliminating the possibility of breaking out of the JavaScript string context with special characters.

Patch summary

In app/View/Servers/preview_event.ctp, the expression h($tag['id']) inside the onclick attribute's JavaScript string was replaced with (int)$tag['id']. This changes the output from an HTML-escaped string to a strictly integer value, preventing any non-numeric characters from being injected into the inline script context.

CVSS rationale

AV:N - the attack originates from a remote linked server over the network. AC:L - the injection is straightforward (embed a quote in a tag ID). AT:N - no special timing or race conditions required. PR:L - the attacker must be a configured linked server, which requires some level of trust/access but not full admin. UI:A - the victim must actively view the event preview and interact with the tag element. VC/VI/VA:N - the MISP server itself is not compromised; the impact is in the victim's browser. SC:N - no meaningful confidentiality impact on the subsequent component is guaranteed. SI:L - the injected script can perform limited actions (redirect, read page data, submit forms) in the user's session. SA:N - no availability impact on the subsequent component.

Weakness rationale

CWE-79 The tag ID is embedded in an inline JavaScript onclick handler where HTML escaping (h()) does not neutralize JavaScript string breakout characters. This is a classic case of improper output encoding for a JavaScript context, resulting in reflected XSS.
CWE-116 The root cause is using HTML entity encoding (h()) in a context that requires JavaScript string escaping. The encoding mechanism is inappropriate for the output context, which is a sub-category of the XSS issue.

Attack pattern rationale

CAPEC-1 The vulnerability is a reflected XSS where attacker-controlled data (a tag ID from a linked server) is injected into an inline JavaScript event handler without proper context-aware encoding. CAPEC-1 is the closest general match. The specific sub-technique is injection into a JavaScript string literal within an HTML attribute, which is not separately enumerated in CAPEC.
CAPEC-126 The attacker exploits the fact that the single-quote character (or similar) is not properly handled when the tag ID is placed inside a JavaScript string within an HTML attribute. The HTML escaping does not account for the JavaScript string delimiter. This CAPEC captures the character-handling aspect of the flaw. Uncertainty: CAPEC-1 is more directly about XSS; CAPEC-126 is included as a supplementary mapping for the encoding mismatch.

Assumptions to verify

The affected version boundary is inferred from the tag v2.5.48 with 28 commits after the fix; the exact first affected version is not stated in the patch.
The attacker is assumed to be a linked/remote MISP server that can control tag IDs in events shared with the local instance; the exact trust model and authentication for linked servers is not detailed in the patch.
CAPEC-126 is included as a supplementary mapping; the primary and most defensible mapping is CAPEC-1 (Cross Site Scripting).
The CVSS PR:L assumes that being a linked server requires some form of authenticated or trusted relationship, but the exact privilege level is not specified in the patch.
The Co-Authored-By line references an AI tool (Claude Opus 5.5); it is listed as a tool credit, not a human remediation developer.
The impact scope (SC/SI) is assessed conservatively; the actual XSS payload capability depends on the browser context and same-origin policy, which are not fully specified.

Model comparison

Selected qwen3.8:27b by deterministic-consensus-v1
The selected result is closest to model consensus; this heuristic does not establish factual correctness and human review remains required.

Model	Score	Agreement	Confidence	Assumptions
`qwen3.8:27b`	6	11	medium	6

bcp-05-x-03

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        "references": [
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        ],
        "timestamp": "2026-09-24T21:53:31Z",
        "type": "fix-developed"
      }
    ]
  }
}

Show details on NVD website

JSON

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  "cveMetadata": {
    "assignerOrgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
    "assignerShortName": "CIRCL",
    "cveId": "CVE-2026-104907",
    "datePublished": "2026-10-02T15:51:34.565Z",
    "dateReserved": "2026-10-02T15:51:32.541Z",
    "dateUpdated": "2026-10-02T16:18:12.403Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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