March 10, 2026—Hotpatch KB5079420 (OS Builds 26200.7979 and 26100.7979)

Applies To
Windows 11 Enterprise LTSC 2024

This Hotpatch update for Windows 11, version 25H2 and 24H2 (KB5079420), improves functionality, performance, and reliability. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information on Windows update terminology, see the different types of Windows software updates. 

To view the latest updates about this release, visit the Windows release health dashboard or the update history page for Windows 11, version 25H2 and 24H2.

Announcements and messages

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

Windows Secure Boot certificate expiration

Note

  • Windows Secure Boot certificate expiration
  • Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. Microsoft has been updating these certificates on consumer and non-managed business devices for the past months. Devices that haven’t received the newer certificates will continue to start and operate normally, and standard Windows updates will continue to install. We will continue to install the newer certificates via Windows updates in the coming months.
  • You can check your PC status on the Windows Security app. If you are an IT administrator, follow the guidance on the Secure Boot Playbook for Windows clients and Windows Server.

Change log

Change date Change description
April 14, 2026 Know issue update: The workaround content for"Reset this PC might fail with the March 2026 Hotpatch security update or later" was updated. This issue is addressed in KB5085518.
April 09, 2026 Known issue added: "Reset this PC might fail with the March 2026 Hotpatch security update or later"
March 19, 2026 Known issue added: "Signing in with a Microsoft account might fail for Microsoft Teams Free and other apps"
March 10, 2026 This update does not include any changes.

Improvements and fixes

This Hotpatch update includes security and quality improvements.

The following summary outlines key issues addressed by this update. The bold text within the brackets indicates the item or area of the change.

  • This update makes miscellaneous security improvements to internal OS functionality.

Note

Secure Boot certificate updates will be delivered with the next baseline Windows update in April 2026.

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

Signing in with a Microsoft account might fail for Microsoft Teams Free and other apps

Symptom

After installing this update, you might experience an issue signing into apps with a Microsoft account. Even when the device has a working internet connection, an error might appear during sign in that indicates a lack of internet connection and prevents access to Microsoft services and apps such as Microsoft Teams Free and OneDrive.

Note

Only sign ins using Microsoft accounts are affected. Businesses using Microsoft Entra ID for app authentication will not experience this issue.

Other applications affected include, but are not limited to, Microsoft Edge, Excel, Word, and Microsoft 365 Copilot. Whenever a feature in these applications requires signing into a Microsoft account, a similar error message can be encountered.

Workaround

This issue is addressed in KB5085518.

Reset this PC might fail with the March 2026 Hotpatch security update or later

Symptom

Devices that have installed the March 2026 Hotpatch security update (KB5079420) or later might experience failures when performing a Push Button Reset (Reset this PC) when using the "Keep my files" or "Remove everything" options.

After the first phase of the offline reset, users see a black boot screen. The reset doesn't complete as expected. Instead, the device restarts to the desktop and displays the following error message: “There was a problem resetting your PC. No changes were made.”

This issue affects Windows Autopatch–managed commercial devices that meet all the following conditions:

  • The organization manages the device with Windows Autopatch.
  • Hotpatch is enabled to apply security updates.
  • Monthly security updates are installed without restarting the device.

This behavior is limited to Hotpatch servicing window when Hotpatch-enabled devices install March 2026 or later updates.

This issue doesn't affect retail consumer devices, devices that do not use Hotpatch, or devices that are not managed with Windows Autopatch.

Workaround

This issue is addressed in KB5083769.

How to get this update

Before you install this update

Microsoft combines the latest servicing stack update (SSU) for your operating system with the hotpatch update. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

If you are using Windows Update, the latest SSU installs with this update.

Install this update

To install this update, use one of the following Windows and Microsoft release channels.

Release Channels Available Next step
Windows Update Included This update downloads and installs automatically from Windows update and Microsoft Update
Catalog Not included See the other options.
Server Update Services Not included See the other options.

File information

For a list of the files provided in this update, download the file information for cumulative update 5079420.

For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5083532) - version 26100.8035.