MC1172445 – The October 2025 Windows security update is now available

Product:

SharePoint, Windows, Windows Server

Platform:

Online, Windows Desktop, World tenant

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Change type:

Admin impact

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Details:

The October 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 and Windows 10 update history pages. 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 KB5065789 (released September 29, 2025).
This update addresses security issues for your Windows operating system.
This update addresses an issue that caused the print preview screen to stop responding in Chromium-based browsers.
This update addresses an issue that occurred when users signed in to a Windows device using only a Gamepad at the lock screen. If no other input methods-such as touch or fingerprint-were used during sign-in, apps and games did not respond to input afterward.
This update addresses an issue that affects the setup process for Windows Hello face recognition when using USB infrared camera modules. Users were unable to complete setup due to a persistent error message, such as "Make sure your face is centered in the frame."


Short 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: KB5066835
Windows 11, versions 23H2 and 22H2: KB5066793
Windows 11 Enterprise LTSC 2024: Hotpatch Baseline
Windows 10, versions 22H2 and 21H2: KB5066791
Windows 10 Enterprise LTSC 2019 and Windows Server 2019: KB5066586
Windows 10 LTSB 2016 and Windows Server 2016: KB5066836
Windows 10 LTSB 2015: KB5066837
Windows Server 2025: KB5066835
Windows Server 2025 Datacenter: Azure Edition: Hotpatch Baseline
Windows Server 2022: KB5066782
Windows Server 2022 Datacenter: Azure Edition: Hotpatch Baseline
Windows Server 2012 R2: Monthly Rollup: KB5066873
Windows Server 2012: Monthly Rollup: KB5066875
Windows Server 2008 R2 Service Pack 1: Monthly Rollup: KB5066872 / Security Only: KB5066876
Windows Server 2008 SP2: Monthly Rollup: KB5066874 / Security Only: KB5066877

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Created:
2025-10-14

updated:
2025-10-14

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MS Preperations

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summary for non-techies**

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Direct effects for Operations**

Security Vulnerabilities
Failure to install the security update may leave systems exposed to known vulnerabilities, increasing the risk of cyber attacks.
   - roles: IT Security Manager, System Administrator
   - references: https://support.microsoft.com/help/5065789, https://support.microsoft.com/topic/0a8c23de-276c-4396-a6e8-beb5c4a2ec26

User Experience Issues
Not applying the update may result in unresolved issues such as the print preview screen freezing in browsers, leading to frustration and decreased productivity.
   - roles: End User, Help Desk Support
   - references: https://support.microsoft.com/help/5065789, https://support.microsoft.com/topic/235851f3-bc60-4de2-a4b2-88278e1d795d

Device Compatibility Problems
Users may face issues with Windows Hello face recognition setup, causing delays in accessing their devices and applications.
   - roles: End User, IT Support Specialist
   - references: https://support.microsoft.com/help/5065789, https://support.microsoft.com/topic/58e80013-ba94-46ad-a56c-b6691d2405ad

Input Method Failures
If the update is not installed, users may experience input method failures when signing in with a Gamepad, leading to inability to use apps and games.
   - roles: End User, Game Development Team
   - references: https://support.microsoft.com/help/5065789, https://support.microsoft.com/topic/6cdcc1c3-cfbf-41a3-8f0d-0c4a9d2b7d1e

Increased Support Tickets
Failure to prepare for the update may lead to an increase in support tickets related to unresolved issues, straining IT resources.
   - roles: Help Desk Support, IT Manager
   - references: https://support.microsoft.com/help/5065789, https://support.microsoft.com/help/5066791

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IT Security**

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explanation for non-techies**

The October 2025 Windows security update is now available, and it's important to install it to keep your systems secure. Think of these updates like regular maintenance for your car. Just as you would change the oil or check the brakes to ensure your car runs smoothly and safely, these updates help keep your computer systems running efficiently and securely.

This update brings several improvements and fixes. For instance, it resolves an issue with the print preview screen in Chromium-based browsers, which is like fixing a glitchy GPS in your car that wasn't showing the route correctly. It also addresses a problem where users couldn't sign in using a Gamepad, similar to fixing a car key that sometimes wouldn't start the engine. Additionally, there's a fix for setting up Windows Hello face recognition with USB infrared cameras, akin to adjusting your car's rearview mirror so you can see clearly.

To install the update, you'll need to refer to the specific instructions for your version of Windows. It's like following a manual for your specific car model to ensure you're using the right parts and procedures. If you're short on time, there's a video available that provides a quick overview of this month's updates, much like a short tutorial video on how to change a tire.

Remember, keeping your systems updated is crucial for security and performance, just as regular maintenance is vital for the longevity and safety of your vehicle.