Red Hat Keycloak: authenticated user could access administrative or

High8.1CVE-2026-15573 · Published Aug 5, 2026 · updated Aug 31, 2026

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.