CVE-2026-57817

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

Vendor Apache Software Foundation
Product Apache CXF
Weakness CWE-20 · Input validation
Published August 6, 2026
Last update August 6, 2026
View on NVD All CVEs

CVSS base score

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What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

August 6, 2026 CVE published
August 6, 2026 Record updated

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