What's new in KB5086672 (Windows 11 build 26200.8117)
- Windows 11, version 25H2
- Windows 11, version 24H2
- OS Build 26200.8117
- OS Build 26100.8117
Maya Reyes4 min readQuick answer
KB5086672 is an out-of-band update released on March 31, 2026, for Windows 11 version 25H2 and version 24H2. It bumps system builds to OS Build 26200.8117 and OS Build 26100.8117 respectively. As an out-of-band release, it delivers important cumulative fixes outside the regular monthly Patch Tuesday schedule.
Microsoft released KB5086672 on March 31, 2026, as an out-of-band cumulative update for Windows 11 version 25H2 and Windows 11 version 24H2. Installing this update updates your system build number to OS Build 26200.8117 on Windows 11 version 25H2, or OS Build 26100.8117 on Windows 11 version 24H2. Out-of-band releases are unscheduled updates issued outside the standard monthly Patch Tuesday schedule to address immediate platform needs, essential reliability fixes, or crucial component updates.
This release follows several other updates distributed throughout March 2026. These include the March 26 preview update KB5079391 (OS Builds 26200.8116 and 26100.8116), the March 21 out-of-band update KB5085516 (OS Builds 26200.8039 and 26100.8039), and the March 10 mandatory cumulative update KB5079473 (OS Builds 26200.8037 and 26100.8037). Because KB5086672 applies across both active servicing branches of Windows 11, it ensures consistent performance and operating system alignment whether you are running version 24H2 or version 25H2.
Understanding how out-of-band updates work helps clarify why this release appeared outside the typical Patch Tuesday window. While regular security updates arrive on the second Tuesday of each month and optional preview updates arrive toward the end of the month, out-of-band updates are deployed whenever Microsoft identifies an issue that requires prompt attention before the next planned update cycle.
Highlights
- OS Build 26200.8117 update delivered specifically for systems running Windows 11 version 25H2.
- OS Build 26100.8117 update delivered specifically for systems running Windows 11 version 24H2.
- Out-of-band patch distribution issued on March 31, 2026, providing critical servicing fixes outside the standard monthly schedule.
- Cumulative servicing package advancing devices directly from prior builds such as OS Build 26200.8116 and OS Build 26100.8116.
- Dual-branch update alignment servicing both Windows 11 version 24H2 and Windows 11 version 25H2 simultaneously.
Known issues
Microsoft reports no known issues for this update.
Should you install it?
Out-of-band updates like KB5086672 are released specifically to address important system conditions or operational fixes that cannot wait until the next standard cumulative release. If you use Windows 11 version 24H2 or Windows 11 version 25H2, installing KB5086672 ensures your operating system remains completely up to date with the latest cumulative build baseline.
For users who rely on their PCs for daily work, keeping Windows updated with out-of-band patches maintains baseline stability and system integrity. If your device is operating without any problems, you can choose to apply the update immediately via Windows Update or wait for the subsequent monthly cumulative package, which will incorporate all fixes from KB5086672. However, installing out-of-band updates when they are published is generally recommended to keep your device in optimal health.
How to get it
Illustration: the Troubleshoot > Other troubleshooters page under Settings > System
You can install KB5086672 automatically through Windows Update or download it manually using the Microsoft Update Catalog.
To check for and install the update via Windows Update:
- Click on the Start menu and select Settings, or press Windows key + I on your keyboard.
- Select the Windows Update section from the left navigation menu.
- Click the Check for updates button on the main pane.
- When KB5086672 appears in your update list, click Download & install.
- Allow the installation wizard to complete the file download and preliminary setup.
- Click Restart now when prompted to reboot your computer and complete the transition to OS Build 26200.8117 or OS Build 26100.8117.
To install the update manually using the Microsoft Update Catalog:
- Launch your preferred web browser and go to the official Microsoft Update Catalog website.
- Type KB5086672 in the search box at the upper right corner and click Search.
- Locate the correct download package matching your operating system version (Windows 11 version 24H2 or version 25H2) and hardware architecture.
- Click the Download button next to your selected update entry.
- In the download window that opens, click the standalone file link to save the installer package to your device.
- Double-click the downloaded standalone installer file to launch the installation utility.
- Follow the on-screen instructions to approve the installation and wait for the process to complete.
- Restart your computer when prompted by the installer.
If you encounter issues during installation, you can run the built-in Windows Update troubleshooter in Settings under System, then Troubleshoot, then Other troubleshooters. Once installed, you can verify your build by opening the Run dialog box (Windows key + R), typing winver, and checking that your system reports OS Build 26200.8117 or OS Build 26100.8117.
Sources
Frequently asked questions
What is KB5086672?
KB5086672 is an out-of-band cumulative update released by Microsoft on March 31, 2026, for Windows 11 version 24H2 and version 25H2. It updates systems to OS Builds 26100.8117 and 26200.8117.
Why did Microsoft release KB5086672 as an out-of-band update?
Microsoft releases out-of-band updates outside the standard monthly Patch Tuesday schedule to deliver critical servicing fixes or address unexpected platform issues that require prompt resolution.
How can I check if KB5086672 is installed on my PC?
Press the Windows key + R to open the Run dialog box, type winver, and press Enter. If the update is installed, your OS build will show as 26200.8117 on version 25H2 or 26100.8117 on version 24H2.
Are there any known issues in KB5086672?
Microsoft reports no known issues for this update.
Checked against Microsoft's release notes on ; re-checked when a new build ships.
Covers Windows 11 update releases and the problems that follow them. Tracks Microsoft's release-health notes daily and flags known issues the same day they appear.
More from Maya Reyes