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Emergency Patch Released for Microsoft Office Due to Exploited Vulnerability

First seen 27 Jan 2026, 08:54 UTC • Uk.Pcmag

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Microsoft has issued an emergency patch for a vulnerability, CVE-2026-21509, affecting Microsoft 365 Apps for Enterprise and Office 2019 and 2016. The flaw is currently being exploited in phishing attacks targeting vulnerable systems. Users are advised to update their software to mitigate the risk.

ThreatCluster AI

Attack Flow

10 entities, 8 inferred relationships (STIX 2.1).

Technique (1)

Phishing

Organization (1)

Microsoft

Vulnerability (1)

CVE-2026-21509

Indicator (1)

cve.org

Affected Platform (6)

Microsoft 365 Apps For Enterprise
Microsoft Office 2016
Microsoft Office 2019
Microsoft Office LTSC 2021
Microsoft Office LTSC 2024
Office 2021

Relationships

CVE-2026-21509 targets Microsoft 365 Apps For Enterprise
CVE-2026-21509 targets Microsoft Office 2016
CVE-2026-21509 targets Microsoft Office 2019
CVE-2026-21509 targets Microsoft Office LTSC 2021
Phishing targets Microsoft 365 Apps For Enterprise
Phishing targets Microsoft Office 2016
Phishing targets Microsoft Office 2019
Phishing targets Microsoft Office LTSC 2021

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Emergency Patch Released for Microsoft Office Due to Exploited Vulnerability

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