May 12, 2026—KB5087538 (OS Build 17763.8755)
Applies To
Windows Server 2019Win 10 Ent LTSC 2019
Release Date:
5/12/2026
Version:
OS Build 17763.8755
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 Server 2019Windows 10, version 1809
Applies to: Windows Server 2019
This security update includes fixes and quality improvements that are part of the following update:
The following is a summary of the issues that this update addresses when you install this update. The bold text within the brackets indicates the item or area of the change we are documenting.
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