{"schema_version": "1.6.1", "id": "CVE-2026-57817", "summary": "The authorization code hash (c_hash) is not enforced for the hybrid OIDC flow", "details": "The OpenID Connect Core 1.0 specification mandates that the RP MUST validate the `c_hash` parameter when operating in the Hybrid Flow. If an Apache CXF RP is integrated with a non-compliant or misconfigured Identity Provider (IdP) that omits the `c_hash`, the RP becomes vulnerable to Authorization Code Substitution/Injection attacks. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue.", "affected": [{"ranges": [{"type": "SEMVER", "events": [{"introduced": "4.2.0"}, {"fixed": "4.2.3"}]}, {"type": "SEMVER", "events": [{"introduced": "4.0.0"}, {"fixed": "4.1.8"}]}, {"type": "SEMVER", "events": [{"introduced": "0"}, {"fixed": "3.6.12"}]}]}], "references": [{"type": "WEB", "url": "https://lists.apache.org/thread/pj63c3pf7kkp1xhr53do704fwj3t3htn"}]}