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
ESU Family
Windows Server 2012
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2
Windows Server 2012 R2 (Server Core installation)
Windows Family
Windows 10 Version 1607 for 32-bit Systems
Windows 10 Version 1607 for x64-based Systems
Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows 10 Version 21H2 for 32-bit Systems
Windows 10 Version 21H2 for ARM64-based Systems
Windows 10 Version 21H2 for x64-based Systems
Windows 10 Version 22H2 for 32-bit Systems
Windows 10 Version 22H2 for ARM64-based Systems
Windows 10 Version 22H2 for x64-based Systems
Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 23H2 for x64-based Systems
Windows 11 Version 24H2 for ARM64-based Systems
Windows 11 Version 24H2 for x64-based Systems
Windows 11 Version 25H2 for ARM64-based Systems
Windows 11 Version 25H2 for x64-based Systems
Windows Server 2016
Windows Server 2016 (Server Core installation)
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows Server 2022, 23H2 Edition (Server Core installation)
Windows Server 2025
Windows Server 2025 (Server Core installation)
Resolved Vulnerabilities
0 vulnerabilities rated Critical and 1 vulnerability rated Important were found.
Windows Family
Critical-rated privilege escalation vulnerability in Windows SMB Server (CVE-2026-20848)
Vulnerability Patches
The following product-specific Vulnerability Patches were made available in the January 20, 2026 Update. Please use the Windows Update feature for automatic installation or refer to the URLs in the product information below to download and install.