Russian hackers exploit recently patched Microsoft Office bug in attacks

Ukraine's Computer Emergency Response Team (CERT) says that Russian hackers are exploiting CVE-2026-21509, a recently patched vulnerability in multiple versions of Microsoft Office.
Infosecurity Magazine

Fancy Bear Exploits Microsoft Office Flaw in Ukraine, EU Cyber-Attacks

Russia-linked hacking group Fancy Bear is exploiting a brand-new vulnerability in Microsoft Office, CERT-UA says ...

Use Microsoft Office? Hackers can infect your PC with a malicious document - patch it ASAP

Microsoft's latest zero-day patch blocks a viral Office document hack - how to protect your PC ASAP ...
WinBuzzer

Microsoft Patches Office Zero-Day Under Active Exploitation

Microsoft has released an emergency patch for CVE-2026-21509, a zero-day Office vulnerability under active exploitation that ...