Applies To
Windows 10

Release Date:

8/12/2025

Version:

OS Build 10240.21100

Windows Secure Boot certificate expiration 

Important: 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.

Windows updates do not install Microsoft Store application updates. If you are an enterprise user, see Microsoft Store apps - Configuration Manager. If you are a consumer user, see Get updates for apps and games in Microsoft Store.

Support for Windows 10 will end in October 2025

After October 14, 2025, Microsoft will no longer provide free software updates from Windows Update, technical assistance, or security fixes for Windows 10. Your PC will still work, but we recommend moving to Windows 11.

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Change date

Change description

September 9, 2025

  • Added the "Unexpected User Account Control (UAC) prompt when doing MSI repair operations" known issue and resolution to the "Known issue in this update" section.

Summary

This article lists the security issues and quality improvements included in this security update.

Applies to: Windows 10, version 1507 (RTM)

This security update includes fixes and improvements that are a part of the following update:

The following is a summary of the key issues that this update addresses when you install this update. If there are new features, it lists them as well. The bold text within the brackets indicates the item or area of the change we are documenting.

  • [Internal Windows OS] This update contains miscellaneous security improvements to internal Windows OS functionality. No specific issues are documented for this release.

If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.

For more information about security vulnerabilities, please refer to the new Security Update Guide website and the August 2025 Security Updates.

Known issues in this update

Symptoms

A security improvement was included in the August 2025 Windows security update and later updates to enforce the requirement that User Account Control (UAC) prompt for administrator credentials when performing Windows Installer (MSI) repair and related operations. This improvement addressed security vulnerability CVE-2025-50173.

After installing the update, standard users might see a User Account Control (UAC) prompt in several scenarios. 

  • Running MSI repair commands (such as msiexec /fu).

  • Opening Autodesk apps, including some versions of AutoCAD, Civil 3D and Inventor CAM, or when installing an MSI file after a user signs into the app for the first time.

  • Installing apps that configure per user.

  • Running Windows Installer during Active Setup.

  • Deploying packages through Manager Configuration Manager (ConfigMgr) that rely on user-specific "advertising" configurations.

  • Enabling Secure Desktop.

If a non-admin user runs an app that initiates an MSI repair operation without displaying UI, it will fail with an error message. For example, installing and running Office Professional Plus 2010 as a standard user will fail with Error 1730 during the configuration process.

Resolution

This issue is resolved by Windows updates released on and after September 9, 2025 (KB5065430). We recommend you install the latest update for your devices as it contains important improvements and issue resolutions, including this one.

How to get this update

Before you install this update

To install any Windows 10, version 1507 cumulative update released on or after January 14, 2025, you must first install the latest Servicing Stack Update (SSU). If your device or offline image does not have the latest SSU installed, you cannot install this update.

Caution Until you install the SSU, this update will not be offered to your device. To reduce your security risk, install the SSU as soon as possible.

  • If you use Windows Update, the latest SSU (KB5058527) will be offered to you automatically. After the latest SSU is installed, you will be able to install this update.

  • If you use Windows Update for Business, the latest SSU (KB5058527) will be offered to you automatically. After the latest SSU is installed, you will be able to install this update.

  • If you use the Update Catalog, you must download and install the latest SSU (KB5058527). After the latest SSU is installed, you will be able to install this update.

  • If you are a Windows Server Update Services (WSUS) administrator, you must approve SSU KB5058527 and this update KB5063889.

For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

Install this update

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

Available

Next Step

Available

This update will be downloaded and installed automatically from Windows Update and Microsoft Update.

File information

A list of the files that are included in this update are provided in a CSV (Comma delimited) (*.csv) file. The file can be opened in a text editor such as Notepad or in Microsoft Excel.

Download IconDownload the file information for this cumulative update KB5063889 now.

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