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Microsoft releases urgent patch for actively exploited Office zero-day

Cybernews·Jan 28

✦ NabkaNews BriefAuto-summarized from multiple outlets · verify with the source

Microsoft has released an urgent patch for a zero-day vulnerability in Office that is being actively exploited. The patch addresses a vulnerability identified as CVE-2026-21509. An emergency fix has been issued to counter the active exploitation of this vulnerability.

Full coverage

Microsoft patches actively exploited Office zero-day vulnerability

BleepingComputer·Jan 26

CVE-2026-21509: Actively Exploited Microsoft Office Zero-Day Forces Emergency Patch

SOC Prime·Jan 27

Microsoft Rushes Emergency Fix For Actively Exploited Office Zero-Day

LinkedIn·Jan 26

Microsoft Office Zero-Day (CVE-2026-21509) - Emergency Patch Issued for Active Exploitation

The Hacker News·Jan 27

Microsoft Issues Emergency Patch for Actively Exploited Office Vulnerability

The HIPAA Journal·Jan 27

Microsoft reveals actively exploited Office zero-day, provides emergency fix (CVE-2026-21509)

Help Net Security·Jan 27

Microsoft Releases Patch for Office Zero Day Amid Evidence of Exploitation

Infosecurity Magazine·Jan 27

Microsoft Office CVE-2026-21509 Zero-Day: Emergency Patch Released to Counter Active Exploitation

Rescana·Jan 28

View original report at Cybernews ↗

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