Severity: low Affected versions:
- Apache CXF (org.apache.cxf:cxf-rt-rs-security-sso-oidc) 4.2.0 before 4.2.3 - Apache CXF (org.apache.cxf:cxf-rt-rs-security-sso-oidc) 4.0.0 before 4.1.8 - Apache CXF (org.apache.cxf:cxf-rt-rs-security-sso-oidc) before 3.6.12 Description: 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. Credit: Guanping Zhang reported this vulnerability. (finder) References: https://cxf.apache.org/ https://www.cve.org/CVERecord?id=CVE-2026-57817
