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Protections for CVE-2025-26647 (Kerberos Authentication) In this article Summary Take Action altSecID attributes Timeline of changes Registry Settings Audit Events Event ID: 45 Event ID: 21 Known issue Summary The Windows security updates released on or after April 8, 2025, contain protections for a vulnerability with Kerberos authentication This update provides a change in behavior when the issuing authority of the certificate used for a security