CVE-2026-57817
High · 8.1CVSS
8.1
EPSS
0.7%
Published
Aug 6, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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