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CVE-2026-63687 Apache CXF's JwtRequestCodeFilter copies all claims from a signed request JWT into the authorization parameter map…

Description

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 products and versions

Product Affected versions Fixed in
Apache CXF 4.2 4.2.0 → < 4.2.3 4.2.3
Apache CXF 4.0 4.0.0 → < 4.1.8 4.1.8
Apache CXF 3.6 earliest → < 3.6.12 3.6.12

References

Timeline

  1. Published
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