Protection mechanism failure in Keycloak - CVE-2025-10939
Published: November 18, 2025 / Updated: December 1, 2025
Vulnerability identifier: #VU118576
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-10939
CWE-ID: CWE-693
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain access to the administrative interface.
The vulnerability exists due to incorrect processing of URL paths with certain proxy servers, such as ha-proxy. A remote attacker can force the application into using relative/non-normalized paths to access the /admin application path relative to /realms.
Affected software
Keycloak
Red Hat build of Keycloak
Red Hat build of Keycloak
How to mitigate CVE-2025-10939
Install updates from vendor's website.
Keycloak - update to 26.4.4
Red Hat build of Keycloak - update to 26.4.4
Red Hat build of Keycloak - update to 26.4.4