March 10, 2026—KB5078883 (OS Build 22631.6783)

​​​​​Announcements and messages

This section provides key notifications related to this release, including announcements, change logs, and end-of-support notices.

Improvements

This update addresses security issues for your Windows operating system. ​​​​​​​

This security update contains fixes and quality improvements from KB5075941(released February 10, 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.

• [Secure Boot]

  • With this update, Windows quality updates include additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Devices receive the new certificates only after demonstrating sufficient successful update signals, maintaining a controlled and phased rollout.

  • This update introduces two new PowerShell features to help you manage the ongoing Secure Boot key rollout. The Get-SecureBootUEFI cmdlet now supports the -Decoded option, which displays Secure Boot keys and certificates in a readable format. The Get-SecureBootSVN cmdlet lets you check the Secure Boot Security Version Number (SVN) of your device’s UEFI firmware and bootloader, and report whether the device follows the latest Secure Boot policy.

• [File History] Improved: This update improves the reliability of File History in Control Panel. Files with names that include Chinese characters and Private Use Area characters now back up successfully, helping keep your files protected and available when you need them.

• [Graphics]

  • Improved: This update improves stability affecting certain GPU configurations, helping devices shut down more reliably.

  • Improved: This update improves stability for certain GPU configurations. It helps games and 3D apps run more reliably during intensive graphics use.

• [Texts and Fonts] Improved: This update improves Windows fonts by adding the new Saudi Riyal currency symbol. This change helps keep text clear, accurate, and visually consistent across your Windows apps and experiences​​​​​​​.

• [Windows System Image Manager​​​​​​​] Improved: This update improves the reliability of choosing trusted catalog files. It adds a warning dialog that helps you confirm that the file you select comes from a trusted source.

If you've already installed previous updates, your device will download and install only the new updates included in this package.

For more information about security vulnerabilities, see the Security Update Guide and the March 2026 Security Update.

Windows 11 servicing stack update (KB5079275) - 22621.6773

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 update

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.

File information

For a list of the files provided in this update, download the file information for cumulative update 5078883.   

For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5079275) - versions 22621.6773.