CVE-2026-63687

Summary

Apache CXF's JwtRequestCodeFilter copies all claims from a signed request JWT into the authorization parameter map without excluding security-sensitive parameters. A client that can produce a validly-signed request JWT (e.g., one whose client_secret is known or compromised) can thereby substitute the code_challenge, code_challenge_method, nonce, and state values that were set in the outer HTTP request, undermining PKCE integrity and OpenID Connect replay protection. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue.

Affected Software

VendorProductVersion RangeStatus
Apache Software FoundationApache CXF4.2.0 < 4.2.3affected
Apache Software FoundationApache CXF4.0.0 < 4.1.8affected
Apache Software FoundationApache CXF0 < 3.6.12affected

Weaknesses

  • CWE-345: CWE-345 Insufficient Verification of Data Authenticity

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: total

CVE Program Container

Additional References

References