Riskcovery

CVE-2026-57817

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

State
Published
Severity
8.1 High
Published
Aug 6, 2026
Updated
Aug 7, 2026
Reserved
Jun 25, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.18.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HCISA-ADP

Weaknesses

  • CWE-20 Improper Input Validation

Affected Products

ProductVersions
Apache CXFApache Software Foundation
  • 4.2.0 to before 4.2.3Affected
  • 4.0.0 to before 4.1.8Affected
  • before 3.6.12Affected

References

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