April 14, 2026—KB5082123 (OS Build 17763.8644)
Applies To
Release Date:
4/14/2026
Version:
OS Build 17763.8644
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 article lists the security issues and quality improvements included in this security update.
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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[PowerShell (known issue)] Fixed: After installing Windows updates released on or after January 13, 2026, Japanese language installations of Windows Server 2019 might not correctly display Japanese characters in the PowerShell console.
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[Remote Desktop] This update improves protection against phishing attacks that use Remote Desktop (.rdp) files. When you open an .rdp file, Remote Desktop shows all requested connection settings before it connects, with each setting turned off by default. A one-time security warning also appears the first time you open an .rdp file on a device. For more information, see Understanding security warnings when opening Remote Desktop (RDP) files.
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[Windows Deployment Services (WDS)] This update disables the “Hands-Free Deployment” feature in WDS by default and is no longer a supported feature. For more information about this change, see Windows Deployment Services (WDS) Hands-Free Deployment Hardening Guidance related to CVE-2026-0386.
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[Kerberos protocol] This update changes the default DefaultDomainSupportedEncTypes value for Kerberos Key Distribution Center (KDC) operations to leverage AES-SHA1 for accounts that do not have an explicit msds-SupportedEncryptionTypes Active Directory attribute defined. For more information see, How to manage Kerberos KDC usage of RC4 for service account ticket issuance changes related to CVE-2026-20833.
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[Secure Boot]
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This update enables dynamic status reporting for Secure Boot states in the Windows Security App (Settings > Update & Security > Windows Security). Learn more about the status alerts via badges and notifications. Note that these enhancements are disabled by default on commercial devices and servers.
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This update fixes an issue that could cause a device to enter BitLocker Recovery after Secure Boot updates.
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With this update, Windows quality updates include additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Devices receive the new certificates only after demonstrating sufficient successful update signals, maintaining a controlled and phased rollout.
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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 information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. For an overview of Windows 10, version 1809, see its update history page.
Known issues in this update
We are currently not aware of any issues with this update.
Applies to: Windows 10 Enterprise LTSC 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.
-
[Remote Desktop] This update improves protection against phishing attacks that use Remote Desktop (.rdp) files. When you open an .rdp file, Remote Desktop shows all requested connection settings before it connects, with each setting turned off by default. A one-time security warning also appears the first time you open an .rdp file on a device. For more information, see Understanding security warnings when opening Remote Desktop (RDP) files.
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[Secure Boot]
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This update enables dynamic status reporting for Secure Boot states in the Windows Security App (Settings > Update & Security > Windows Security). Learn more about the status alerts via badges and notifications. Note that these enhancements are disabled by default on commercial devices and servers.
-
This update fixes an issue that could cause a device to enter BitLocker Recovery after Secure Boot updates.
-
With this update, Windows quality updates include additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Devices receive the new certificates only after demonstrating sufficient successful update signals, maintaining a controlled and phased rollout.
-
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 information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. For an overview of Windows 10, version 1809, see its update history page.
Known issues in this update
We are currently not aware of any issues with this update.
Windows 10 servicing stack update (KB5082118) - version 17763.8642
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.
Note: This servicing stack update (SSU) includes enhanced logic to verify whether a device is hosted on Azure, leveraging an updated certificate chain for validation. To ensure that the device can access the required certificate update domains to successfully download and install certificate updates, see Certificate downloads and revocation lists and Azure Certificate Authority details. To learn more about SSUs, see Servicing stack updates.
How to get this update
Before you install this update
You must have installed the August 10, 2021 SSU (KB5005112) before installing this cumulative update.
Install this update
To install this update, use one of the following Microsoft release channels.
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This update will be downloaded and installed automatically from Windows Update. |
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This update will be downloaded and installed automatically from Windows Update for Business in accordance with configured policies. |
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To get the standalone package for this 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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This update will automatically sync with Windows Server Update Services (WSUS) if you configure Products and Classifications as follows:
To set up your WSUS server to sync based on products and classifications, see Synchronizing Update by Product and Classification. To manually import updates into WSUS, see Import updates into WSUS by using PowerShell. |
File information
A list of the files that are included in this 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
If you want to remove this update
CAUTION Before you decide to remove this update, please 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.
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 2019 and Windows 10 Enterprise LTSC 2019 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 LTSC 2019: January 9, 2029
♦ Windows Server 2019: January 9, 2029
We recommend that you upgrade to a later version of Windows Server.
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