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TechRadar
TechRadar
Sead Fadilpašić

Russian hackers are targeting a new Office 365 zero-day, so patch now or face attack

Russia.

  • Russian APT28 (Fancy Bear) exploited CVE-2026-21509 in Microsoft Office days after patch release
  • Malicious DOC files sent to Ukrainian government agencies via themed phishing lures
  • CISA added the flaw to its KEV catalog, urging immediate patching
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