April 19, 2026—KB5091572 (OS Build 14393.9062) Out-of-band
Applies To
Release Date:
19/04/2026
Version:
OS Build 14393.9062
Windows Secure Boot certificate expirationÂ
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. Â
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 article lists the fixes and quality improvements included in this out-of-band update.
Applies to: Windows Server 2016
This out-of-band update includes fixes and improvements that are a part of the following update:
The following is a summary of the issues that this out-of-band update addresses. The bold text within the brackets indicates the item or area of the change we are documenting.
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[Domain controllers (known issue)] Fixed: After installing the April 14, 2026, (KB5082198) 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, only the new updates contained in this package will be downloaded and installed on your device.
For more information about security vulnerabilities, please refer to the new Security Update Guide website and the April 2026 Security Updates.
For more information about Windows 10, version 1607, see its update history page.
For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types.
Known issues in this update
We are currently not aware of any issues with this update.
Applies to: Win 10 Ent LTSB 2016
This out-of-band update applies to Windows Server 2016 only.
How to get this update
Before you install this update
To install updates released on or after January 14, 2025, we recommend you first install the latest Servicing Stack Update (SSU). If your device or offline image does not have the latest SSU installed, you might not be able to install this update.
Caution Until you install the SSU, this update might not be offered to your device. To reduce your security risk, install the SSU as soon as possible.
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If you use Windows Update, the latest SSU (KB5082089) will be offered to you automatically. If the latest SSU is not installed, you might not be able to install this update.
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If you use Windows Update for Business, the latest SSU (KB5082089) will be offered to you automatically. If the latest SSU is not installed, you might not be able to install this update.
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If you use the Update Catalog, we recommend you download and install the latest SSU (KB5082089). If the latest SSU is not installed, you might not be able to install this update.
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If you are a Windows Server Update Services (WSUS) administrator, you must approve SSU KB5082089 and this update KB5091572.
For general information about SSUs, see Servicing stack updates.
Install this update
To install this update, use one of the following Windows and Microsoft release channels.
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This out-of-band update is only available from the Update Catalog. |
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This out-of-band update is only available from the Update Catalog. |
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To get the standalone package for this out-of-band update, go to the Microsoft Update Catalog website. For information about how to download and install updates from the Update Catalog, see How to download updates that include drivers and hotfixes from the Windows Update Catalog. |
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File information
A list of the files that are included in this out-of-band update are provided in a CSV (Comma delimited) (*.csv) file. The file can be opened in a text editor such as Notepad or in Microsoft Excel.
Note: The English (United States) version of this software update might contain files for additional languages.
Related information
Notice for Microsoft Store application 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.
End of support information
Windows Server 2016 and Windows 10 2016 LTSB end of support
Microsoft will no longer provide free software updates from Windows Update, technical assistance, or security fixes on the following end dates:
♦ Windows 10 Enterprise LTSB 2016: October 13, 2026
♦ Windows 10 IoT Enterprise 2016 LTSB: October 13, 2026
♦ Windows Server 2016: January 12, 2027
For more information, see Plan for Windows Server 2016 and Windows 10 2016 LTSB end of support.
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