Microsoft released an out-of-band update to fix the March 2026 non-security preview update, which was pulled over the weekend due to installation issues.
The optional cumulative update (KB5079391) was released on Thursday for Windows 11 24H2 and 25H2 systems, with 29 changes, including Smart App Control and Display improvements.
However, right after it started rolling out, users started reporting errors saying that “Some update files are missing or have problems. We’ll try to download the update again later. Error code: (0x80073712).”
Days after the first reports surfaced, Microsoft stopped the optional update rollout and confirmed the installation issues and 0x80073712 errors.
On Tuesday, Microsoft issued the Windows 11 KB5086672 emergency update for affected Windows 11 25H2 and 24H2 systems, replacing the broken KB5079391 preview update.
“An out-of-band (OOB) update was released today, March 31, 2026, to address this installation issue. This cumulative OOB update for Windows 11, versions 25H2 and 24H2 (KB5086672) supersedes all previous updates and includes all protections and improvements from the March 2026 Windows security and non-security preview updates, as well as this installation fix,” Microsoft said.
“Devices that have Get the latest updates as soon as they’re available turned on may see this update offered automatically through Windows Update when it becomes available for their device. If this setting is turned off, you can install the update manually by going to Settings > Windows Update and selecting Download & install.”
Less than a week ago, Microsoft released another emergency update to address a major issue triggered by this month’s Patch Tuesday Windows 11 security updates, which was breaking sign-ins with Microsoft accounts across multiple Microsoft apps, including Teams, OneDrive, the Edge web browser, and Microsoft 365 Copilot.
Since the start of the month, Microsoft has pushed two other out-of-band updates targeting hotpatch-enabled Windows 11 Enterprise devices, addressing a Bluetooth device visibility bug and several security vulnerabilities in the Routing and Remote Access Service (RRAS) management tool.
It also published guidance for fixing C:\ drive access issues on Samsung Windows 11 laptops caused by buggy versions of the Samsung Galaxy Connect and Samsung Continuity Service apps.
Automated pentesting proves the path exists. BAS proves whether your controls stop it. Most teams run one without the other.
This whitepaper maps six validation surfaces, shows where coverage ends, and provides practitioners with three diagnostic questions for any tool evaluation.
