CVE-2026-57817 Apache CXF: The authorization code hash (c_hash) is not enforced for the hybrid OIDC flow

The OpenID Connect Core 1.0 specification mandates that the RP MUST validate the chash 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 chash, the RP becomes vulnerable to Authorization Code...

CVE-2026-57817

The CVE concerns Apache CXF OpenID Connect RP integrations in Hybrid Flow, where the RP must validate the c_hash parameter per the OpenID Connect Core 1.0 spec. If an IdP is non-compliant or misconfigured and omits c_hash, the RP is vulnerable to Authorization Code Substitution/Injection attacks....

CVE-2026-28498 Authlib: Fail-Open Cryptographic Verification in OIDC Hash Binding

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a library-level vulnerability was identified in the Authlib Python library concerning the validation of OpenID Connect OIDC ID Tokens. Specifically, the internal hash verification logic verifyhash...