Microsoft Support:
December 9, 2025 - KB5071417 (OS Build 22631.6345)
This cumulative update for Windows 11, version 23H2 (KB5071417), 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.
Updating Microsoft Secure Boot keys before expiration in June 2026
UPDATE 4/02: https://support.microsoft.com/en-us/topic/secure-boot-certificate-update-status-in-the-windows-security-app-5ce39986-7dd2-4852-8c21-ef30dd04f046 UPDATE 2/10: https://www.elevenforum.com/t/refreshing-the-root-of-trust-industry-collaboration-on-secure-boot-certificate-updates.44460/...
www.elevenforum.com
Microsoft Store apps updates
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.
Highlights
- This update addresses security issues for your Windows operating system.
Improvements
Normal rollout
Important: Use EKB KB5027397 to update to Windows 11, version 23H2.This security update contains fixes and quality improvements from KB5068865 (released November 11, 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.
- [PowerShell 5.1] Invoke-WebRequest now includes a confirmation prompt with a security warning of script execution risk. You can choose to continue or cancel the request. For additional details, see CVE-2025-54100 and KB5074596: PowerShell 5.1: Preventing script execution from web content.
For more information about security vulnerabilities, see the Security Update Guide and the December 2025 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 updateMicrosoft 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 |
|---|---|
| This update downloads and installs automatically from Windows Update and Microsoft Update. |
|
| To get the standalone package for this update, go to Microsoft Update Catalog. |
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 5071417.
For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5071963) - versions 22621.6265.
Source:
December 9, 2025—KB5071417 (OS Build 22631.6345) - Microsoft Support
support.microsoft.com
Check Windows Updates
UUP Dump:
64-bit ISO download:
Select language for Windows 11, version 23H2 (22631.6345) amd64
Select language for Windows 11, version 23H2 (22631.6345) amd64 on UUP dump. UUP dump lets you download Unified Update Platform files, like Windows Insider updates, directly from Windows Update.
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ARM64 ISO download:
Select language for Windows 11, version 23H2 (22631.6345) arm64
Select language for Windows 11, version 23H2 (22631.6345) arm64 on UUP dump. UUP dump lets you download Unified Update Platform files, like Windows Insider updates, directly from Windows Update.
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UUP Dump - Download Windows Insider ISO
UUP Dump is the most practical and easy way to get ISO images of any Insider Windows 10 or Windows 11 version, as soon as Microsoft has released a new build. UUP Dump creates a download configuration file according to your choices, downloads necessary files directly from Microsoft servers, and...
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