Vulnerability in Red Hat Build of Keycloak

[ Description ]Official description

A flaw was found in the OIDC implementation of Keycloak, specifically within the Device Authorization Grant flow. This component allows devices with limited input capabilities to obtain security tokens. The issue occurs because the flow fails to check the minimum authentication level required by a client configuration. This allows an attacker who has stolen a user's password to bypass mandatory multi-factor authentication and gain unauthorized access to the Keycloak Admin REST API.

[ 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-Bund5 Oct 2026WID-SEC-2026-3749

  Keycloak: Vulnerability allows bypassing security measures Translated from German

  CVE-2026-105305

[ References ]References

• access.redhat.com/security/cve/CVE-2026-105305
• bugzilla.redhat.com/show_bug.cgi