cve-2026-21509
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June 2026 CVE Landscape
Gamaredon Exploits WinRAR to Deliver GammaWorm and GammaSteel Against Ukraine
Exploits and vulnerabilities in Q1 2026
Russia's 'Fancy Bear' APT Continues Its Global Onslaught
APT28 Deploys PRISMEX Malware in Campaign Targeting Ukraine and NATO Allies
CVE-2026-21509: Actively Exploited Microsoft Office Security Feature Bypass — PoC Public, CISA KEV Listed
APT28 hackers deploy customized variant of Covenant open-source tool
APT28 Tied to CVE-2026-21513 MSHTML 0-Day Exploited Before Feb 2026 Patch Tuesday
January 2026 CVE Landscape: 23 Critical Vulnerabilities Mark 5% Increase, APT28 Exploits Microsoft Office Zero-Day
Russia is hacking zero-days again
February 2026 Patch Tuesday
Patch Tuesday, February 2026 Edition
Microsoft Patches 6 Actively Exploited Zero-Days
"Danger Bulletin": UAC-0001 (APT28) carries out cyberattacks against Ukraine and EU countries using the CVE-2026-21509 exploit (CERT-UA#19542)
Bulletin d'actualité CERTFR-2026-ACT-005 (02 février 2026)
Microsoft Office zero-day lets malicious documents slip past security checks
CISA Adds Five Known Exploited Vulnerabilities to Catalog
Microsoft Office vulnerability (CVE-2026-21509) in active exploitation
Microsoft Releases Patch for Office Zero Day Amid Evidence of Exploitation
February 2026 Patch Tuesday forecast: Lots of OOB love this month
Microsoft releases urgent Office patch. Russian-state hackers pounce.
Russian hackers exploited a critical Office bug within days of disclosure
Russian hackers are exploiting recently patched Microsoft Office vulnerability (CVE-2026-21509)
APT28 Uses Microsoft Office CVE-2026-21509 in Espionage-Focused Malware Attacks
Russian hackers exploit recently patched Microsoft Office bug in attacks
Russia-linked APT28 attackers already abusing new Microsoft Office zero-day
Microsoft releases update to address zero-day vulnerability in Microsoft Office
Microsoft Office Security Restriction Bypass Vulnerability
Microsoft Office Zero-Day (CVE-2026-21509) - Emergency Patch Issued for Active Exploitation
CVE-2026-21509: Microsoft Office Security Feature Bypass Vulnerability