Low [CVE-2026-57817] Authorization Code Substitution via missing c_hash validation
This low-severity Red Hat Linux advisory covers CVE-2026-57817 affecting Red Hat build of Apache Camel for Spring Boot 4, Red Hat JBoss Web Server 5.
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Summary
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. Such an attack could lead to unauthorized access or session hijacking.
This vulnerability has a Low impact on Red Hat products. Exploitation requires a specific misconfiguration of the external IdP.
Red Hat severity: Low — CVSS 3.7 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N). Weakness: CWE-303.
Affected Red Hat products: Red Hat build of Apache Camel for Spring Boot 4; Red Hat JBoss Web Server 5. Will not fix / out of support: Red Hat JBoss Web Server 5.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 26 days ago·verify at source
- 4.2.3
- 4.1.8
- 3.6.12
Official advisory · high-confidence parse· fetched 26 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 26 days ago·verify at source
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