UPDATE 10/28:
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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.
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To learn more about Windows update terminology, see types of Windows updates and monthly quality update types. For an overview, see the update history page for Windows 11, version 24H2 and version 25H2.
Stay informed! Follow @WindowsUpdate for the latest updates from the Windows Release Health Dashboard.
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.
Change Log
For more information about security vulnerabilities, see the Security Update Guide website and the October 2025 Security Updates.
Symptoms
Some Digital TV and Blu-ray/DVD apps might not play protected content as expected after installing the August 29, 2025, Windows non-security preview update (KB5064081), or later updates.
Apps that use Enhanced Video Renderer with HDCP enforcement or Digital Rights Management (DRM) for digital audio might show copyright protection errors, frequent playback interruptions, unexpected stops, or black screens.
Streaming services are not affected.
Workaround
This issue is partially resolved. Problems affecting certain applications that use Enhanced Video Renderer with HDCP enforcement have been addressed in the September 2025 Windows preview update (KB5065789) and later updates.
We recommend installing the latest update for your device. It includes important improvements and fixes, including a resolution for this issue.
However, some apps that use DRM for digital audio might still experience problems.
We’re investigating a long-term solution for affected apps and will share more information when it's available.
Symptoms
After installing October 2025 security update (KB5066835), USB devices, such as keyboards and mice, do not function in the Windows Recovery Environment (WinRE). This issue prevents navigation of any of the recovery options within WinRE. Note that the USB keyboard and mouse continue to work normally within the Windows operating system.
Workaround
This issue is addressed in KB5070773.
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.
1 This latest cumulative update includes updates for AI components. Even though the AI component updates are included in the update, the AI components are only applicable to Windows Copilot+ PCs and will not install on Windows PC or Windows Server.
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 5066835.
For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5067360) - version 26100.6893.
support.microsoft.com
Check Windows Updates
ISO or USB from Microsoft Media Creation Tool (MCT):
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UUP Dump:
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ARM64 ISO download:
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KB5067036 Windows 11 Cumulative Update Preview build 26100.7019 (24H2) and 26200.7019 (25H2) - Oct. 28
UPDATE 11/11: https://www.elevenforum.com/t/kb5068861-windows-11-cumulative-update-build-26100-7171-24h2-and-26200-7171-25h2-nov-11.41909/ Microsoft Support: This non-security update for Windows 11, version 24H2 (KB5067036), improves functionality, performance, and reliability. To learn more...
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Microsoft Support:
October 14, 2025 - KB5066835 (OS Builds 26200.6899 and 26100.6899)
Windows Secure Boot certificate expirationImportant: 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
https://techcommunity.microsoft.com/event/windowsevents/ask-microsoft-anything-secure-boot---may-2026/4513524 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...
www.elevenforum.com
To learn more about Windows update terminology, see types of Windows updates and monthly quality update types. For an overview, see the update history page for Windows 11, version 24H2 and version 25H2.
Stay informed! Follow @WindowsUpdate for the latest updates from the Windows Release Health Dashboard.
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.
Change Log
Change date | Change description |
|---|---|
| October 22, 2025 |
|
| October 19, 2025 |
|
Highlights
- This update addresses security issues for your Windows operating system.
Improvements
This security update contains fixes and quality improvements from KB5065789 (released September 29, 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.- [Browser] Fixed: This update addresses an issue that caused the print preview screen to stop responding in Chromium-based browsers.
- [Gaming] Fixed: An issue 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.
- [PowerShell]
- Fixed: This update addresses an issue that affects PowerShell Remoting and Windows Remote Management (WinRM), where commands might time out after 10 minutes.
- Fixed: This update addresses an issue that prevented an audit event from being logged.
- [Windows Hello] Fixed: 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.”
- [Compatibility] This update removes the ltmdm64.sys driver. Fax modem hardware dependent on this specific driver will no longer work in Windows.
- [Cryptography] This update enforces a security hardening improvement by requiring use of Key Storage Provider (KSP) instead of Cryptographic Service Provider {CSP) for RSA-based smart card certificates. If you experience problems with smart card authentication as a result of this design change, see the Windows Release Health site for resolution steps. For additional details, see CVE-2024-30098.
- [File Explorer] After installing this update, File Explorer automatically disables the preview feature for files downloaded from the internet. This change is designed to enhance security by preventing a vulnerability when users preview potentially unsafe files. For details, including steps to unblock files, see File Explorer automatically disables the preview feature for files downloaded from the internet.
For more information about security vulnerabilities, see the Security Update Guide website and the October 2025 Security Updates.
AI Components
This release updates the following AI components:| AI Component | Version |
|---|---|
| Image Search | 1.2509.1022.0 |
| Content Extraction | 1.2509.1022.0 |
| Semantic Analysis | 1.2509.1022.0 |
| Settings Model | 1.2509.1022.0 |
Windows 11 servicing stack update (KB5067360)- 26100.6893
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
1 Problems playing protected content in some BluRay/DVD/Digital TV apps
Symptoms
Some Digital TV and Blu-ray/DVD apps might not play protected content as expected after installing the August 29, 2025, Windows non-security preview update (KB5064081), or later updates.
Apps that use Enhanced Video Renderer with HDCP enforcement or Digital Rights Management (DRM) for digital audio might show copyright protection errors, frequent playback interruptions, unexpected stops, or black screens.
Streaming services are not affected.
Workaround
This issue is partially resolved. Problems affecting certain applications that use Enhanced Video Renderer with HDCP enforcement have been addressed in the September 2025 Windows preview update (KB5065789) and later updates.
We recommend installing the latest update for your device. It includes important improvements and fixes, including a resolution for this issue.
However, some apps that use DRM for digital audio might still experience problems.
We’re investigating a long-term solution for affected apps and will share more information when it's available.
2 USB mouse and keyboard not working in the Windows Recovery Environment
Symptoms
After installing October 2025 security update (KB5066835), USB devices, such as keyboards and mice, do not function in the Windows Recovery Environment (WinRE). This issue prevents navigation of any of the recovery options within WinRE. Note that the USB keyboard and mouse continue to work normally within the Windows operating system.
Workaround
This issue is addressed in KB5070773.
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. |
| Yes 1 | Before you install this update To get the standalone package(s) for this update, go to the Microsoft Update Catalog website. This KB contains one or more MSU files that require installation in a specific order. Install this update Method 1: Install all MSU files together Download all MSU files for KB5066835 from Microsoft Update Catalog and place them in the same folder (for example, C:/Packages). Use Deployment Image Servicing and Management (DISM.exe) to install the target update. DISM will use the folder specified in PackagePath to discover and install one or more prerequisite MSU files as needed. Updating Windows PC To apply this update to a running Windows PC, run the following command from an elevated Command Prompt: DISM /Online /Add-Package /PackagePath:c:\packages\Windows11.0-KB5066835-x64.msuOr, run the following command from an elevated Windows PowerShell prompt: Add-WindowsPackage -Online -PackagePath "c:\packages\Windows11.0-KB5066835-x64.msu"Or use Windows Update Standalone Installer to install the target update. Updating Windows Installation media To apply this update to Windows Installation media, see Update Windows installation media with Dynamic Update. Note: When downloading other Dynamic Update packages, ensure they match the same month as this KB. If the SafeOS Dynamic Update or Setup Dynamic Update is not available for the same month as this KB, use the most recently published version of each. To add this update to a mounted image, run the following command from an elevated Command Prompt: DISM /Image:mountdir /Add-Package /PackagePath:Windows11.0-KB5066835-x64.msuOr, run the following command from an elevated Windows PowerShell prompt: Add-WindowsPackage -Path "c:\offline" -PackagePath "Windows11.0-KB5066835-x64.msu" -PreventPendingMethod 2: Install each MSU file individually, in order Download and install each MSU file individually either using DISM or Windows Update Standalone Installer in the following order:
|
1 This latest cumulative update includes updates for AI components. Even though the AI component updates are included in the update, the AI components are only applicable to Windows Copilot+ PCs and will not install on Windows PC or Windows Server.
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 5066835.
For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5067360) - version 26100.6893.
Source:
October 14, 2025—KB5066835 (OS Builds 26200.6899 and 26100.6899) - Microsoft Support
support.microsoft.com
Check Windows Updates
ISO or USB from Microsoft Media Creation Tool (MCT):
Download Official Windows 11 ISO file from Microsoft
This tutorial will show you how to download an official Windows Server or Windows 11 64-bit or ARM64 ISO file from Microsoft. Microsoft provides ISO files for Windows Server and Windows 11 to download. You can use these ISO files to clean install or in-place upgrade Windows 11. The Flight Hub...
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Select language for Windows 11, version 25H2 (26200.6899) amd64
Select language for Windows 11, version 25H2 (26200.6899) 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 24H2 (26100.6899) arm64
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Select language for Windows 11, version 25H2 (26200.6899) arm64
Select language for Windows 11, version 25H2 (26200.6899) 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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Last edited:
For one upgrade to have the multiple significant failures as KB5066835 has had, it's clear that they didn't do enough testing. MSC is spending too much time on the sizzle and not enough time in the steak! Some of the silly cosmetic changes should be postponed until they get their act together on the real functions.
