Bug 2511977 (CVE-2026-57817) - CVE-2026-57817 org.apache.cxf/cxf: Apache CXF: Authorization Code Substitution via missing c_hash validation
Summary: CVE-2026-57817 org.apache.cxf/cxf: Apache CXF: Authorization Code Substitutio...
Keywords:
Status: NEW
Alias: CVE-2026-57817
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-06 11:11 UTC by OSIDB Bzimport
Modified: 2026-09-24 19:57 UTC (History)
33 users (show)

Fixed In Version:
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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:71675 0 None None None 2026-09-24 19:57:28 UTC

Description OSIDB Bzimport 2026-08-06 11:11:12 UTC 
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.
Comment 1 Jon Orris 2026-09-24 19:57:26 UTC 
This issue has been addressed in the following products:

  Red Hat build of Apache Camel 4.18.4 for Spring Boot 3.5.16

Via RHSA-2026:71675 https://access.redhat.com/errata/RHSA-2026:71675
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