CVE-2025-11537: Red Hat Build Of Keycloak

Medium severity, CVSS 5.0. EPSS: 0.2% chance of exploitation in the next 30 days.

A flaw was found in Keycloak. When the logging format is configured to a verbose, user-supplied pattern (such as the pre-defined 'long' pattern), sensitive headers including Authorization and Cookie are disclosed to the logs in cleartext. An attacker with read access to the log files can extract these credentials (e.g., bearer tokens, session cookies) and use them to impersonate users, leading to a full account compromise.

Affected products

• Red Hat Red Hat Build Of Keycloak

Published 2026-02-10. Last modified 2026-06-17.