Applies To
Windows 11 version 23H2, all editions

Release Date:

1/13/2026

Version:

OS Build 22631.6491

​​​​​This cumulative update for Windows 11, version 23H2 (KB5073455), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information on Windows update terminology, see the different types of Windows software updates.

To view the latest updates about this release, visit the Windows release health dashboard or the update history page for Windows 11, version 23H2.

Tip: This month’s video is available in the Windows 11, version 25H2 and 24H2 article.

Announcements and messages

This section provides key notifications related to this release, including announcements, change logs, and end-of-support notices.

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, see Windows Secure Boot certificate expiration and CA updates.

Windows Updates do not include updates for Microsoft Store apps.

If you're an enterprise user, see Microsoft Store apps - Configuration Manager. If you're a consumer user, see Get updates for apps and games in Microsoft Store.

​​​​​​​Improvements​​​​​​​

This update addresses security issues for your Windows operating system. ​​​​​​​

Important: Use EKB KB5027397 to update to Windows 11, version 23H2.

This security update contains fixes and quality improvements from KB5071417 (released December 9, 2025). The following summary outlines key issues addressed by this update. Also, included are available new features. The bold text within the brackets indicates the item or area of the change.

  • [Compatibility] This update removes the following modem drivers: agrsm64.sys (x64), agrsm.sys (x86), smserl64.sys (x64) and smserial.sys (x86). Modem hardware dependent on these specific drivers will no longer work in Windows.

  • [Display Kernel] Fixed: This update addresses an issue affecting Remote Desktop Protocol (RDP) connections, where the connection fails and you might need to restart your device.

  • [Input] Fixed: This update addresses an issue that affects apps such as Outlook, Teams, Edge, Chrome, and Excel. These apps might close unexpectedly when you enter text. ​​​​​​​

  • [Secure Boot] Starting with this update, Windows quality updates include a subset of high confidence device targeting data that identifies devices eligible to automatically receive new Secure Boot certificates. Devices will receive the new certificates only after demonstrating sufficient successful update signals, ensuring a safe and phased deployment.

  • [WinSqlite3.dll] Fixed: The Windows core component, WinSqlite3.dll, has been updated. Previously, some security software might have detected this component as vulnerable. 

    Note: WinSqlite3.dll is a separate component from sqlite3.dll, which is found in application-specific directories and is not a Windows component. If security applications continue to detect sqlite3.dll as vulnerable, contact the developer of the app using sqlite3.dll for an update. If sqlite3.dll is being used by a Microsoft app, install the latest version of the app from the Microsoft Store.

If you've already installed previous updates, your device will download and install only the new updates included in this package.

For more information about security vulnerabilities, see the Security Update Guide and the January 2026 Security Update.

Windows 11 servicing stack update (KB5071963) - 22621.6265

This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. To learn more about SSUs, see Simplifying on-premises deployment of servicing stack updates.

Known issues in this update​​​​​​​

Microsoft is not currently aware of any issues with this update.

How to get this update

Before you install this update

Microsoft combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

Install this update

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

Available

Next Step

Included

This update downloads and installs automatically from Windows Update and Microsoft Update.

If you want to remove the LCU

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 cumulative update 5073455.   

For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5071963) - versions 22621.6265. 

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