January 13, 2026—KB5073724 (OS Builds 19045.6809 and 19044.6809)
Applies To
Windows 10 ESUWindows 10 Enterprise LTSC 2021
Release Date:
1/13/2026
Version:
OS Builds 19045.6809 and 19044.6809
Windows Secure Boot certificate expiration
Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance. For details and preparation steps, see Windows Secure Boot certificate expiration and CA updates.
Windows updates do not install Microsoft Store application updates. If you are an enterprise user, see Microsoft Store apps - Configuration Manager. If you are a consumer user, see Get updates for apps and games in Microsoft Store.
| | | | --- | --- | | Change date | Change description | | January 17, 2026 | - Added the resolution for the known issue "Connection and authentication failures in Azure Virtual Desktop and Windows 365". |
This article lists the security issues and quality improvements included in this security update.
Windows 10, version 22H2Windows 10, version 21H2
Applies to: Windows 10, version 22H2
Important: Use EKB KB5015684 to update to Windows 10, version 22H2.
This security update includes fixes and quality...
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