MS Family January 2026 Routine Security Update Advisory

Overview

 

Microsoft(https://www.microsoft.com) has released a security update that fixes vulnerabilities in products it has supplied. users of affected products are advised to update to the latest version.

 

Affected Products

 

Microsoft 365 Apps for Enterprise for 32-bit Systems https://aka.ms/OfficeSecurityReleases and earlier

Microsoft 365 Apps for Enterprise for 64-bit Systems https://aka.ms/OfficeSecurityReleases Older versions

Microsoft Office 2016 (32-bit edition) https://aka.ms/OfficeSecurityReleases Older versions

Microsoft Office 2016 (64-bit edition) https://aka.ms/OfficeSecurityReleases Older versions

Microsoft Office 2019 for 32-bit editions https://aka.ms/OfficeSecurityReleases Older versions

Microsoft Office 2019 for 64-bit editions https://aka.ms/OfficeSecurityReleases Older versions

Microsoft Office LTSC 2021 for 32-bit editions https://aka.ms/OfficeSecurityReleases Older versions

Microsoft Office LTSC 2021 for 64-bit editions https://aka.ms/OfficeSecurityReleases Older versions

Microsoft Office LTSC 2024 for 32-bit editions https://aka.ms/OfficeSecurityReleases Older versions

Microsoft Office LTSC 2024 for 64-bit editions https://aka.ms/OfficeSecurityReleases Older versions

 

Resolved Vulnerabilities

 

0 vulnerabilities rated Critical and 1 vulnerability rated Important were found.

Critical security feature bypass vulnerability in Microsoft Office (CVE-2026-21509)

 

Vulnerability Patches

 

The following product-specific vulnerability patches were made available in the January 26, 2026 Update. Please use the Windows Update feature to install automatically or refer to the URLs in the product information below to download and install.