This cumulative update for Windows 11, version 23H2 (KB5131087), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. Visit the Windows release health dashboard for the latest status on this release.
Announcements and messages
This section provides key notifications related to this release, including announcements, change logs, and end-of-support notices.
Important
Windows 11, version 23H2 Enterprise and Education have reached end of updates. The November 2026 Windows security update is the last update available for these editions. Devices running these editions will no longer receive monthly security updates containing protections from the latest security threats. We recommend updating eligible devices running Windows 11, version 23H2 to a supported version of Windows 11. For more information about product lifecycle dates, see Windows 11 release information and Lifecycle FAQ - Windows.
Windows Secure Boot certificate expiration
Secure Boot certificate updates remain in progress as Microsoft transitions devices from certificates that began expiring in 2026 to newer certificates. Devices that have not yet received the newer certificates can continue to start and receive standard Windows updates. Microsoft will continue delivering the newer Secure Boot certificates to eligible devices through Windows Update.
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 the Windows security update KB5126653 (released October 13, 2026) and from the out-of-band update KB5134130 (released October 26, 2026). 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.
[Security updates] This update provides security improvements. For more information about the security vulnerabilities resolved by this update, see the Security Update Guide
[Secure Boot] This update includes additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Certificate deployment via Windows updates continues across supported PCs and non-managed business devices in the coming months.
[Printing] Fixed: Adding a printer published in Active Directory through Settings > Bluetooth & devices > Printers & scanners > Add device might fail with error 87, “The parameter is incorrect.” This issue was introduced by the October 2026 update and does not generally affect existing printers or printing.
[Security] This update improves NTLM security by enabling clients to offer NTLM message signing by default for non-anonymous connections. This change helps reduce exposure to NTLM relay attacks and provides auditing to identify connections that are not using signing. To learn more, see NTLM signing security improvements in Windows.
[Remote Desktop] Fixed: The “Specify thumbprints of certificates representing trusted .rdp publishers” policy could not be configured successfully through Microsoft Intune.
[Date and Time] This update adjusts daylight saving time (DST) rules for Cuba for the extended 2026-2027 DST period. Cuba remains on UTC-04:00 and doesn't observe the November 2026 and March 2027 transitions. It returns to UTC-05:00 in November 2027 and resumes its regular seasonal schedule in 2028.
- For the latest DST and time zone guidance, see the Daylight Saving Time & Time Zone Blog.
[Windows PowerShell] This update strengthens security for PowerShell script signing and signature verification by introducing stricter encoding validation. As a result, scripts containing invalid UTF-8 encoding might fail signature validation, even if they were previously accepted. To resolve this issue, review the affected scripts, save them using valid UTF-8 encoding with a byte order mark (BOM), and sign them again. For further guidance, see Encoding Guidance for Signed PowerShell Scripts.
If you've already installed previous updates, your device will download and install only the new updates included in this package.
Known issues in this update
Microsoft is not currently aware of any issues with this update.
Windows 11 servicing stack update (KB5132696) - 22621.7698
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 Servicing stack updates.
How to get this update
Before you install this update
For Windows Update: You must have the Windows update released on or after July 8, 2025 (such as KB5062552) installed before installing this update.
For Windows Server Update Services (WSUS) deployment or when installing the standalone package from Microsoft Update Catalog: You must have the Windows update released on or after July 8, 2025 (such as KB5062552) installed before installing this update.
For Servicing Stack Update (SSU): You must have installed servicing stack update version 22621.5619 or later before installing this update. To determine the latest SSU installed on your device, run
DISM /Online /Get-Packages | findstr /i "ServicingStack"from an elevated command prompt. The Package Identity line returned must be version 22621.5619 or later.
Deployment
If you deploy dynamic updates such as this update to an existing Windows image, ensure the boot.stl file is included as part of the installation media. Failure to include the file might prevent devices from successfully starting from the installation media and can result in error code 0xc0430001.
Note
The boot.stl file is used during Secure Boot validation and must match the Windows version and architecture of the image you are updating.
To ensure the boot.stl file is included as part of the installation media, do one of the following:
- Use the Update WinPE script to update an existing Windows image. (Recommended)
- Manually copy the boot.stl file from the device Windows\Boot\EFI folder to the corresponding folder on your installation media before deploying the update.
For information about how to apply Dynamic Update packages to existing Windows images, see Update Windows installation media with Dynamic Update.
Install this update
To install this update, use one of the following Windows and Microsoft release channels.
| Available | Next Step |
|---|---|
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This update downloads and installs automatically from Windows Update and Microsoft Update. |
File information
For a list of the files provided in this update, download the file information for cumulative update KB5131087.
For a list of the files provided in the servicing stack update, download the file information for SSU KB5132696 - versions 22621.7698.
Related topics
Microsoft Store for Business and Education with Configuration Manager