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CVE-2026-65583 – Authentication Bypass – Apache CXF OIDC (3.x < 3.6.12, 4.0.0–4.1.7, 4.2.0–4.2.2)

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Summary

CVE-2026-65583 is an authentication bypass vulnerability in the OpenID Connect (OIDC) relying-party support of Apache CXF (org.apache.cxf:cxf-rt-rs-security-sso-oidc). The flaw lies in ID token validation, where self-issued ID tokens can be accepted without enforcing required claim checks, allowing an attacker to bypass authentication with a crafted token. It carries a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: Insufficient verification of data authenticity (CWE-345) in the OIDC relying-party token validation logic.
  • Trigger conditions: The relying party accepts self-issued ID tokens without enforcing the required claim checks. Such tokens are disabled by default, so a non-default configuration that enables them is required for exploitation.
  • Attack vector: Network — an unauthenticated remote attacker can submit a crafted token to the vulnerable endpoint.
  • Impact: Authentication bypass leading to high impact on confidentiality and integrity.

Affected software

  • Apache CXF 3.x before 3.6.12
  • Apache CXF 4.0.0 through 4.1.7 (before 4.1.8)
  • Apache CXF 4.2.0 through 4.2.2 (before 4.2.3)

Severity

CVSS v3.1 base score: 9.1 (Critical)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation and recommended actions

  • Immediate: Upgrade to Apache CXF 3.6.12, 4.1.8, or 4.2.3 (or later) depending on your branch.
  • If no patch: Ensure acceptance of self-issued ID tokens is not enabled in the OIDC relying-party configuration, and restrict network access to affected OIDC endpoints.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Page title: CXF - Service list

References

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Map your entire attack surface (continously)

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4

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