CVE-2026-57817
Apache CXF: The authorization code hash (c_hash) is not enforced for the hybrid OIDC flow
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-20 |
| Vendor | apache software foundation |
| Product | apache cxf |
| Published | Aug 6, 2026 |
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Affected Versions
Apache Software Foundation / Apache CXF
4.2.0 < 4.2.3 4.0.0 < 4.1.8 0 < 3.6.12
References
Credits
Guanping Zhang reported this vulnerability.