KB5087537

May 12, 2026—KB5087537 (OS Build 14393.9140)

Applies To

Windows Server 2016, all editionsWin 10 Ent LTSB 2016Win 10 IoT Ent LTSB 2016

Release Date:

5/12/2026

Version:

OS Build 14393.9140

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:

• Prepare your servers for Secure Boot certificate updates

• Windows Server Secure Boot playbook

Summary

This article lists the security issues and quality improvements included in this cumulative security update.

Windows Server 2016Windows 10, version 1607

Applies to: Windows Server 2016

This security update includes fixes and improvements that are a part of the following update:

• April 14, 2026—KB5082198 (OS Build 14393.9060)

• April 19, 2026—KB5091572 (OS Build 14393.9062) Out-of-band

The following is a summary of the issues that this update addresses. The bold text within the brackets indicates the item or area of the change we are documenting.

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