Vulnerability-Lookup

CVE-2026-62263 (GCVE-0-2026-62263)

Vulnerability from cvelistv5 – Published: 2026-09-15 09:52 – Updated: 2026-09-15 13:53

Title

OpenAM: WebAuthn Java deserialization RCE via ObjectInputFilter depth>1 bypass

Summary

Open Access Management (OpenAM) is an access management solution. Prior to 16.1.2, WebAuthnAuthentication.deserialize applies an ObjectInputFilter that allows every serialized object at depth greater than 1 and therefore constrains only an AuthenticatorImpl root object. A pre-authentication attacker can supply a userHandle whose serialized graph has a valid AuthenticatorImpl root and a nested gadget class, causing readObject or readResolve execution before the cast and assertion verification when a usable gadget is on the classpath. This bypasses the incomplete remediation for the earlier WebAuthn deserialization vulnerability. This issue is fixed in version 16.1.2.

Severity

9.2 (Critical)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 13:26 UTC

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/OpenIdentityPlatform/OpenAM/se…	x_refsource_CONFIRM
https://github.com/OpenIdentityPlatform/OpenAM/co…	x_refsource_MISC
https://github.com/OpenIdentityPlatform/OpenAM/re…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
OpenIdentityPlatform	OpenAM	Affected: < 16.1.2

Show details on NVD website

JSON

To clipboard

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EUVD-2026-94928

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-03 10:56

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

JSON

To clipboard

{
  "assigner": "ENISA",
  "date_reserved": "2026-10-03T10:56:17.250676+00:00",
  "id": "EUVD-2026-94928"
}

FKIE_CVE-2026-62263

Vulnerability from fkie_nvd - Published: 2026-09-15 10:17 - Updated: 2026-09-23 18:21

Severity

9.2 (Critical) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/OpenIdentityPlatform/OpenAM/commit/9dd0fbe07f70f118cf45042d3a9ffb32f3c21e08
	security-advisories@github.com	https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.2
	security-advisories@github.com	https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-gf8h-gq53-288j

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "OpenAM",
          "vendor": "OpenIdentityPlatform",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 16.1.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Open Access Management (OpenAM) is an access management solution. Prior to 16.1.2, WebAuthnAuthentication.deserialize applies an ObjectInputFilter that allows every serialized object at depth greater than 1 and therefore constrains only an AuthenticatorImpl root object. A pre-authentication attacker can supply a userHandle whose serialized graph has a valid AuthenticatorImpl root and a nested gadget class, causing readObject or readResolve execution before the cast and assertion verification when a usable gadget is on the classpath. This bypasses the incomplete remediation for the earlier WebAuthn deserialization vulnerability. This issue is fixed in version 16.1.2."
    }
  ],
  "id": "CVE-2026-62263",
  "lastModified": "2026-09-23T18:21:42.327",
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          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 9.2,
          "baseSeverity": "CRITICAL",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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    {
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      "url": "https://github.com/OpenIdentityPlatform/OpenAM/commit/9dd0fbe07f70f118cf45042d3a9ffb32f3c21e08"
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    }
  ]
}

GHSA-GF8H-GQ53-288J

Vulnerability from github – Published: 2026-07-24 21:08 – Updated: 2026-07-24 21:08

Summary

OpenAM: WebAuthn Java deserialization RCE via ObjectInputFilter depth>1 bypass

Details

Summary

The GHSA-6c99-87fr-6q7r fix wrapped WebAuthn authenticator deserialization in an ObjectInputFilter meant to allow only AuthenticatorImpl, but it short-circuits to ALLOWED for any object at stream depth > 1. Because the Java serialization filter is consulted for every class in the graph (and depth == 1 only for the root's concrete class), the allowlist constrains only the root and leaves the entire nested graph unchecked.

Impact

An attacker can craft a stream rooted at AuthenticatorImpl with an arbitrary gadget chain nested inside. The gadget's readObject/readResolve executes during readObject() — before the cast and before any assertion verification — enabling remote code execution when a gadget is on the classpath. The deserialization sink is reached pre-authentication via an attacker-chosen userHandle.

Severity

9.2 (Critical)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 16.1.1"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.openidentityplatform.openam:openam-auth-webauthn"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "16.1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-62263"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-24T21:08:46Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "### Summary\nThe GHSA-6c99-87fr-6q7r fix wrapped WebAuthn authenticator deserialization in an `ObjectInputFilter` meant to allow only `AuthenticatorImpl`, but it short-circuits to `ALLOWED` for any object at stream `depth \u003e 1`. Because the Java serialization filter is consulted for every class in the graph (and `depth == 1` only for the root\u0027s concrete class), the allowlist constrains only the root and leaves the entire nested graph unchecked.\n\n### Impact\nAn attacker can craft a stream rooted at `AuthenticatorImpl` with an arbitrary gadget chain nested inside. The gadget\u0027s `readObject`/`readResolve` executes during `readObject()` \u2014 before the cast and before any assertion verification \u2014 enabling remote code execution when a gadget is on the classpath. The deserialization sink is reached pre-authentication via an attacker-chosen `userHandle`.",
  "id": "GHSA-gf8h-gq53-288j",
  "modified": "2026-07-24T21:08:46Z",
  "published": "2026-07-24T21:08:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-gf8h-gq53-288j"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OpenIdentityPlatform/OpenAM/commit/9dd0fbe07f70f118cf45042d3a9ffb32f3c21e08"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/OpenIdentityPlatform/OpenAM"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OpenAM: WebAuthn Java deserialization RCE via ObjectInputFilter depth\u003e1 bypass"
}

UBUNTU-CVE-2026-62263 (CVE-2026-62263)

Vulnerability from osv_ubuntu – Published: 2026-09-15 10:17 – Updated: 2026-09-23 23:31 – Source website

Details

Severity

9.2 (Critical)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-62263	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-62263	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "openam",
            "binary_version": "1.4.0-1build6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "openam",
        "purl": "pkg:deb/ubuntu/openam@1.4.0-1build6?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.0-1build6"
      ]
    }
  ],
  "aliases": [],
  "details": "Open Access Management (OpenAM) is an access management solution. Prior to 16.1.2, WebAuthnAuthentication.deserialize applies an ObjectInputFilter that allows every serialized object at depth greater than 1 and therefore constrains only an AuthenticatorImpl root object. A pre-authentication attacker can supply a userHandle whose serialized graph has a valid AuthenticatorImpl root and a nested gadget class, causing readObject or readResolve execution before the cast and assertion verification when a usable gadget is on the classpath. This bypasses the incomplete remediation for the earlier WebAuthn deserialization vulnerability. This issue is fixed in version 16.1.2.",
  "id": "UBUNTU-CVE-2026-62263",
  "modified": "2026-09-23T23:31:26Z",
  "published": "2026-09-15T10:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-62263"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-62263"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-62263"
  ]
}

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.

Action not permitted

CVE-2026-62263 (GCVE-0-2026-62263)

EUVD-2026-94928

FKIE_CVE-2026-62263

GHSA-GF8H-GQ53-288J

Summary

Impact

UBUNTU-CVE-2026-62263 (CVE-2026-62263)

Tags

Sightings

Nomenclature

Related by attack behaviour