- Russian hackers exploit recently patched Microsoft Office bug in attacks BleepingComputer
- Microsoft Office Zero-Day (CVE-2026-21509) – Emergency Patch Issued for Active Exploitation The Hacker News
- Fancy Bear Exploits Microsoft Office Flaw in Ukraine, EU Cyber-Attacks Infosecurity Magazine
- Russia-linked APT28 attackers already abusing new Microsoft Office zero-day theregister.com
- CVE-2026-21509 Exploited by APT28 via WebDAV and COM SOC Prime
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