Vulnerability in Red Hat Build of Keycloak

[ Description ]Official description

A flaw was found in the secure-redirect-uris-enforcer client policy of Keycloak, an identity and access management solution. The issue occurs when the policy is configured to allow loopback addresses, as Keycloak resolves hostnames via DNS during validation. An attacker can bypass domain allowlist restrictions by using a hostname that resolves to a loopback address, potentially allowing the registration of unauthorized redirect URIs.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund27 Oct 2026WID-SEC-2026-4191

  Keycloak: Multiple vulnerabilities Translated from German

  CVE-2026-117627CVE-2026-117688CVE-2026-118030+2 more CVEs

[ References ]References

• access.redhat.com/security/cve/CVE-2026-118425