MC1193628: The December 2025 Windows security update is now available

The December 2025 security update is now available for all supported versions of Windows. We recommend that you install these updates promptly. For more information about the contents of this update, see the release notes, which are easily accessible from the Windows 11 update history page. To learn more about the different types of monthly quality updates, see Windows monthly updates explained.  Highlights for the Windows 11, version 25H2 update: 

• This security update includes improvements that were a part of update KB5070311 (released December 1, 2025).
• This update addresses security issues for your Windows operating system. 
• This update addresses an issue where Ask Copilot didn’t activate the Click to Do* window as expected. The window now appears in the foreground when you share data with Copilot.
• This update addresses an issue where File Explorer briefly flashes white when you navigate between pages. This issue might occur after you install KB5070311.
• This update fixes an issue where external virtual switches lose their physical network adapter (NIC) bindings after a host restart. 

* Experiences for Copilot+ PCs onlyShort on time? Watch our Windows 11 release notes video for this month's tips.For instructions on how to install this update, see the KB for your operating system listed below: 

• Windows 11, versions 25H2 and 24H2: KB5072033
• Windows 11, version 23H2: KB5071417
• Windows 11 Enterprise LTSC 2024: Hotpatch KB5072014
• Windows 10, versions 22H2 and 21H2: KB5071546
• Windows 10 Enterprise LTSC 2019 and Windows Server 2019: KB5071544
• Windows 10 LTSB 2016 and Windows Server 2016: KB5071543
• Windows Server 2025: KB5072033
• Windows Server 2025 Datacenter: Azure Edition: Hotpatch KB5072014
• Windows Server 2022: KB5071547
• Windows Server 2022 Datacenter: Azure Edition: Hotpatch KB5071413
• Windows Server 2012 R2: Monthly Rollup: KB5071503
• Windows Server 2012: Monthly Rollup: KB5071505
• Windows Server 2008 R2 Service Pack 1: Monthly Rollup: KB5071501 / Security Only: KB5071506
• Windows Server 2008 SP2: Monthly Rollup: KB5071504 / Security Only: KB5071507

Note A separate standalone PowerShell update is available for the versions of Windows listed below and will be offered for devices using hotpatch updates. If any PowerShell components are active during installation, a system restart will be required to complete the update.

• Windows 11, versions 24H2 and 25H2: KB5074204
• Windows Server 2025: KB5074204
• Windows Server 2022: KB5074353

IMPORTANT Because of minimal operations during the Western holidays and the upcoming new year, there will be no December 2025 non-security preview update in the second part of the month. Normal monthly servicing for both security and non-security preview updates will resume in January 2026.