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CVE-2026-68079 – OAuth2 Authorization Code Replay (Authentication Bypass) – Apache CXF ≤ 3.6.11, 4.0

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Summary

CVE-2026-68079 is an authorization code replay vulnerability (authentication bypass by capture-replay, CWE-294) in Apache CXF’s OAuth2 support. The DefaultEncryptingCodeDataProvider fails to invalidate an authorization code after it is redeemed, allowing a captured code to be exchanged for tokens an unlimited number of times. It is rated Critical (CVSS 9.8).

Technical details

  • Root cause: A flawed removeCodeGrant implementation in DefaultEncryptingCodeDataProvider does not properly remove or invalidate an OAuth2 authorization code after it has been used.
  • Trigger conditions: An attacker obtains a valid authorization code and submits it to the token endpoint more than once.
  • Attack vector: Network; no authentication or user interaction required (AV:N/AC:L/PR:N/UI:N).
  • Impact: A single captured authorization code can be redeemed repeatedly, violating the OAuth2 requirement that codes be single-use, leading to unauthorized token issuance and compromise of confidentiality, integrity, and availability.

Affected software

  • Apache CXF 4.2.0 through 4.2.2
  • Apache CXF 4.0.0 through 4.1.7
  • Apache CXF versions prior to 3.6.12

Severity

  • CVSS v3.1 base score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade to a fixed release — Apache CXF 4.2.3, 4.1.8, or 3.6.12 (or later).
  • If no patch: The advisory documents no alternative workaround; upgrading to a fixed version is required.

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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IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

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