High [CVE-2026-63687] Security bypass due to improper handling of authorization parameters
This high-severity Red Hat Linux advisory covers CVE-2026-63687 affecting Red Hat build of Apache Camel for Spring Boot 4, Red Hat Fuse 7, Red Hat JBoss Enterprise Application Platform 7.
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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. This vulnerability allows an attacker, who has compromised a client's secret, to bypass critical security protections in the authorization process.
By injecting malicious values for parameters like code_challenge and nonce, the attacker can undermine the integrity of Proof Key for Code Exchange (PKCE) and OpenID Connect replay protection, potentially leading to unauthorized access or session hijacking.
This could lead to unauthorized access or session hijacking in applications utilizing affected Red Hat middleware products that rely on these security mechanisms. Red Hat severity: Important — CVSS 7.1 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N).
Weakness: CWE-807.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 4.2.3
- 4.1.8
- 3.6.12
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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