May 12, 2026—KB5087544 (OS Builds 19045.7291 and 19044.7291)
Applies To
Windows 10 ESUWindows 10 Enterprise LTSC 2021Windows 10 IoT Enterprise LTSC 2021
Release Date:
5/12/2026
Version:
OS Builds 19045.7291 and 19044.7291
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 for Windows devices, see Windows Secure Boot certificate expiration and CA updates.
For details and preparation steps for Windows servers, see the following resources:
This article lists the security issues and quality improvements included in this cumulative security update.
Windows 10, version 22H2Windows 10, version 21H2
Applies to: Windows 10 ESU
Important: Use EKB KB5015684 to update to Windows 10, version 22H2.
This security update includes fixes and quality improvements that are part of the following updates:
The following is a summary of the issues that this update...
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