Vulnerability in Red Hat Advanced Cluster Security for Kubernetes 4.11

[ Description ]Official description

A flaw was found in Red Hat Advanced Cluster Security for Kubernetes (RHACS). The Central SAML authentication ACS endpoint does not retain used SAML assertion or response identifiers to prevent replay. An attacker who obtains a valid, unexpired signed SAML response can submit it multiple times and receive distinct Central authentication tokens for the mapped identity.

[ 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-Bund20 Oct 2026WID-SEC-2026-4065

  Red Hat Advanced Cluster Security for Kubernetes (RHACS): Vulnerability allows bypassing security measures Translated from German

  CVE-2026-103314

[ References ]References

• access.redhat.com/errata/RHSA-2026:85932
• access.redhat.com/security/cve/CVE-2026-103314
• bugzilla.redhat.com/show_bug.cgi