Keycloak vulnerable to authorization bypass via incorrect uri comparison

Summary

### Description A flaw was found in Keycloak Policy Enforcer. This vulnerability allows any authenticated user to bypass all authorization policies, including role, scope, and User-Managed Access (UMA) permission checks. By including the configured access-denied page path within a request URL, either as a path segment or a query parameter, an attacker can gain unauthorized access to protected resources.

Remediation

1. Inventory every org.keycloak:keycloak-services deployment, including staging.
2. Upgrade org.keycloak:keycloak-services to the fixed version for your release line, listed under Affected versions.
3. Confirm the running version after the upgrade.

References

• Advisoryhttps://github.com/advisories/GHSA-f5p5-6xmx-p252
• Referencehttps://github.com/keycloak/keycloak/security/advisories/GHSA-f5p5-6xmx-p252
• Referencehttps://nvd.nist.gov/vuln/detail/CVE-2026-9800
• Referencehttps://access.redhat.com/errata/RHSA-2026:30049
• Referencehttps://access.redhat.com/errata/RHSA-2026:30050
• Referencehttps://access.redhat.com/errata/RHSA-2026:30083
• Referencehttps://access.redhat.com/errata/RHSA-2026:30084
• Referencehttps://access.redhat.com/errata/RHSA-2026:36002
• Referencehttps://access.redhat.com/errata/RHSA-2026:36013
• Referencehttps://access.redhat.com/errata/RHSA-2026:50846
• Referencehttps://access.redhat.com/errata/RHSA-2026:50847
• Referencehttps://access.redhat.com/security/cve/CVE-2026-9800