Vulnerability in Red Hat Build of Keycloak

[ Description ]Official description

A flaw was found in the OIDC Dynamic Client Registration (DCR) component of Keycloak. A bug in the response serialization causes the backchannel logout offline token revocation setting to be omitted from responses. When a client performs a standard update, this missing information causes the setting to be silently disabled. As a result, offline tokens may remain valid even after a user session is terminated via backchannel logout.

[ 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-Bund8 Oct 2026WID-SEC-2026-3849

  Keycloak: Multiple vulnerabilities Translated from German

  CVE-2026-107889CVE-2026-107623CVE-2026-107604

[ References ]References

• access.redhat.com/security/cve/CVE-2026-107623
• bugzilla.redhat.com/show_bug.cgi