CVE-2026-21509

Microsoft Office Patch: Urgent Fix for Russian-State Hackers

February 5, 2026

Russian flag made of binary code, symbolizing cyber warfare.

A Russian state-linked hacking group (APT28/Fancy Bear) rapidly exploited a critical Microsoft Office vulnerability (CVE-2026-21509) within two days of its…

BigTech Companies

Fancy Bear Targets Ukraine, EU with Microsoft Office Flaw

February 4, 2026

Illustration of a bear in a jacket holding documents, with a Russian flag and map in the background.

The Russian-linked cyber group Fancy Bear is exploiting a critical Microsoft Office vulnerability (CVE-2026-21509) to target Ukrainian and EU organizations,…

BigTech Companies

Microsoft patches exploited Office zero-day, Fortinet fixes SSO flaw

February 3, 2026

Cybersecurity Week in Review text overlay on a world map and circuit board background.

Microsoft and Fortinet issued emergency patches for critical, actively exploited vulnerabilities (CVE-2026-21509 in Office and CVE-2026-24858 in FortiCloud), highlighting the…

BigTech Companies

Microsoft patches critical Office zero-day under active attack

January 29, 2026

Microsoft has urgently patched a critical, actively exploited Office vulnerability (CVE-2026-21509) that bypasses security features, requiring immediate updates to prevent…

BigTech Companies

Microsoft fixes critical Office zero-day under active attack

January 28, 2026

Microsoft has urgently patched a critical, actively exploited zero-day vulnerability (CVE-2026-21509) in Office, which allows attackers to bypass security features…