Applies To
Windows Server 2022

Release Date:

4/19/2026

Version:

OS Build 20348.5024

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:

Summary

This out-of-band update for Windows Server 2022 (KB5091575) is cumulative. It includes fixes and improvements that are part of the following update:

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

  • [Domain controllers (known issue)] Fixed: After installing the April 14, 2026, (KB5082142) Windows security update and restarting, domain controllers with multi-domain forests that use Privileged Access Management (PAM), might experience startup issues. In some cases, Local Security Authority Subsystem Service (LSASS) might stop responding, leading to repeated restarts, and preventing authentication and directory services, which can make the domain unavailable.

If you installed earlier updates, your device downloads and installs only the new updates contained in this package.

To view the latest updates about this release, visit the Windows release health dashboard or the update history page for Windows Server 2022. 

Windows Server 2022 servicing stack update (KB5082137) - 20348.5021

Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). SSUs improves the reliability of the update process and includes fixes to the servicing stack, the component that installs Windows updates. To learn more about SSUs, see Servicing stack updates.

Known issues in this update

After installing KB5070884 or later updates, Windows Server Update Services (WSUS) does not display synchronization error details within its error reporting. This functionality is temporarily removed to address the Remote Code Execution Vulnerability, CVE-2025-59287. 

How to get this update

Install this update

To install this update, use one of the following Windows and Microsoft release channels.

Available

Next Step

Not included

This update is only available from the Microsoft Update Catalog.

If you want to remove the LCU 

CAUTION Before you decide to remove this update, see Understanding the risks: Why you should not uninstall security updates.

To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument. You can find the package name by using this command: DISM /online /get-packages.

Running Windows Update Standalone Installer (wusa.exe) with the /uninstall switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation.

File Information

For a list of the files provided in this update, download the file information for out-of-band update 55091575.. 

For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5082137) - version 20348.5021. 

Facebook LinkedIn Email
SUBSCRIBE RSS FEEDS

Need more help?

Want more options?

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Microsoft 365 subscription benefits

Microsoft 365 training

Microsoft security

Accessibility center