Microsoft · Security update · January 26, 2026

KB5002713: January 2026 security update

KB5002713, released January 26, 2026, fixes 1 CVE across 2 products. One of them is being exploited (CVE-2026-21509); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.

Patch now1 on CISA KEVUnsupported product

CVEs closed

None rated Critical

Exploited

CVE-2026-21509

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.7082

99th percentile

Applies to

Product
Microsoft Office 2016 (32-bit edition)
Microsoft Office 2016 (64-bit edition)

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Patch now	CVE-2026-21509	Microsoft Office	Security Feature Bypass	7.8	0.7082	KEVExploited

Vendor advisory

https://support.microsoft.com/help/5002713

Our write-up

January 2026 Patch Tuesday: 114 Vulnerabilities, 3 Zero-Days, and a Broken RDP Update

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