Improper Authentication in Apache CXF - CVE-2026-57817
Published: August 24, 2026
Vulnerability identifier: #VU144827
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-57817
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to inject or substitute an authorization code.
The vulnerability exists due to improper authentication in the OIDC relying party hybrid flow implementation when processing hybrid flow responses from a non-compliant or misconfigured identity provider that omits the c_hash parameter. A remote attacker can supply a substituted authorization code to inject or substitute an authorization code.
Exploitation requires integration with an identity provider that omits the c_hash parameter in the hybrid OIDC flow.
Affected software
Apache CXF
How to mitigate CVE-2026-57817
Install security update from vendor's website.
Apache CXF - addressed in versions 3.6.12, 4.1.8, 4.2.3