Microsoft reveals actively exploited Office zero-day, provides emergency fix (CVE-2026-21509)
Microsoft reveals actively exploited Office zero-day, provides emergency fix (CVE-2026-21509) 2026-01-27 at 11:22 By Zeljka Zorz Microsoft released emergency Office security updates to fix a security feature bypass vulnerability (CVE-2026-21509) that its threat intelligence and security teams spotted being exploited in the wild in zero-day attacks. Users and admins are advised to review the associated […]