Vulnerability in Red Hat Build Of Keycloak

CVE-2026-15573

A flaw was found in Keycloak's Authorization Services. The component responsible for matching request paths to security policies (PathMatcher) does not properly normalize URIs before comparison. By adding extra characters like a trailing slash or matrix parameters to a URL, an attacker can trick the system into applying a less restrictive security policy than intended. This allows an authenticated user to access administrative or restricted areas they should not have permission to see.

EPSS: 0.003 (24.9th percentile) — read the EPSS interpretation.