Vulnerability in Red Hat Build of Keycloak

[ Description ]Official description

Keycloak provides a feature called mTLS holder-of-key binding which ensures that a token can only be used by the client that originally requested it by binding it to their digital certificate. A flaw was discovered where the new Standard Token Exchange V2 feature does not check for this certificate. This allows an attacker with stolen client credentials to obtain a standard, unrestricted token that bypasses these security protections.

[ 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-Bund24 Sep 2026WID-SEC-2026-3569

  Keycloak: Vulnerability allows bypassing security measures Translated from German

  CVE-2026-97846

[ References ]References

• access.redhat.com/security/cve/CVE-2026-97846
• bugzilla.redhat.com/show_bug.cgi