Windows 11 emergency update KB5086672 fixes the install loop caused by KB5079391
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Microsoft has released an out-of-band Windows 11 update, KB5086672, to fix installation failures caused by the March 26 preview update KB5079391. The company published the patch on March 31, 2026 for Windows 11 versions 24H2 and 25H2, and says it resolves the issue that triggered error code 0x80073712 during installation.
The fix moves affected systems to OS Builds 26100.8117 and 26200.8117. Microsoft’s update history pages show KB5086672 as the replacement out-of-band release after KB5079391, which had advanced systems only to builds 26100.8116 and 26200.8116 before deployment issues forced a change.
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For users who hit the loop, this is the update that matters now. Microsoft’s release history makes clear that KB5086672 supersedes the broken March 26 preview and should restore the normal servicing path for devices on 24H2 and 25H2.
What went wrong with KB5079391
The underlying problem came from KB5079391, the March 26 non-security preview update. That release failed for some users with error 0x80073712, an error commonly tied to missing or corrupted update files, and Microsoft later replaced it with the emergency patch.
Because KB5079391 was a preview update, not a standard Patch Tuesday security release, not every Windows 11 device would have tried to install it automatically. Still, for people who did install previews or who manage test rings in business environments, the bug disrupted normal update deployment and blocked access to the latest quality improvements.
Microsoft’s documentation also shows that KB5086672 includes the earlier March fixes. In other words, users do not need to install the broken preview first. The out-of-band patch replaces it and bundles the relevant improvements into a working release.
What KB5086672 includes
KB5086672 is not just a narrow installer hotfix. Microsoft says it is a cumulative out-of-band update, which means it carries forward the previous security and quality fixes for supported Windows 11 24H2 and 25H2 systems.
The update also refreshes several AI-related Windows components. Microsoft lists version 1.2603.377.0 for Image Search, Content Extraction, Semantic Analysis, and the Settings Model. Those component updates ship alongside the main fix in the March 31 release.
That means affected users get two things at once: a fix for the installation loop and the latest packaged improvements that should have arrived through the March preview path.
How to get the patch
For most home users, the quickest route is Windows Update. Microsoft says devices can receive KB5086672 through the normal Windows Update channel, and users can also check manually in Settings if they want the fix immediately.
For IT admins, Microsoft’s Windows message center points to Intune expedited quality updates and Windows Autopatch guidance for deploying the out-of-band release. That gives enterprise teams a supported way to push the emergency update quickly across managed fleets.
Microsoft also makes the patch available through the Microsoft Update Catalog for offline or controlled deployment scenarios. That matters for admins who need to stage the update manually or service systems outside standard consumer update flows.
Windows 11 KB5086672 at a glance
| Item | Detail |
|---|---|
| Update | KB5086672 |
| Release date | March 31, 2026 |
| Type | Out-of-band cumulative update |
| Affected versions | Windows 11 24H2 and 25H2 |
| Fixes | Install failures caused by KB5079391 |
| Main error | 0x80073712 |
| New builds | 26100.8117 and 26200.8117 |
What users and admins should do
- Check whether your device tried to install KB5079391 and failed with 0x80073712.
- Install KB5086672 through Windows Update or your managed deployment tool.
- Confirm the system build now shows 26100.8117 or 26200.8117, depending on branch.
- Use the Update Catalog if you need an offline package.
- For managed environments, use Intune expedited quality updates or Windows Autopatch guidance from Microsoft.
FAQ
It fixes installation failures tied to KB5079391 on Windows 11 24H2 and 25H2. Microsoft released it on March 31, 2026 as an out-of-band update.
Microsoft lists Windows 11 versions 24H2 and 25H2 for KB5086672.
The failed installations showed error 0x80073712.
Microsoft says IT admins should use Intune expedited quality updates or Windows Autopatch guidance for the out-of-band release.
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