August 12, 2025—Hotpatch KB5063812 (OS Build 20348.3989)
Applies To
Release Date:
8/12/2025
Version:
OS Build 20348.3989
Windows Secure Boot certificate expirationImportant: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance. For details and preparation steps, see Windows Secure Boot certificate expiration and CA updates.
To learn more about Windows update terminology, see types of Windows updates and monthly quality update types. For an overview, see the update history page for Windows Server 2022.Â
Stay informed! Follow @WindowsUpdate for the latest updates from the Windows Release health dashboard.
Improvements and fixes
This security update includes quality improvements. The following summary outlines key issues addressed by the KB update after you install it.Â
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This update makes miscellaneous security improvements to internal OS functionality. There are no additional issues documented in this release.
If you installed earlier updates, your device downloads and installs only the new updates contained in this package.Â
How to get this updateÂ
Before you install this updateÂ
Microsoft now 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 or Windows Server Update Services (WSUS), the latest SSU installs with this update.
​​​​​​​Install this update
To install this update, use one of the following Windows and Microsoft release channels.
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This update downloads and installs automatically from Windows update and Microsoft Update. |
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See the other options. |
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This update automatically syncs with Windows Server Update Services (WSUS) if you configure Products and Classifications as follows: Product:Â Server 2022 Hotpatch Category Classification: Security Updates |
File information
For a list of the files provided in this update, download the file information for cumulative update 5063812​​​​​​​.
For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5062793) - version 20348.3920.
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