In a notable update for September 2025, Microsoft has rolled out a total of 86 security updates across its product suite, which includes 9 critical and 72 important patches. Additionally, there are 5 patches addressing non-Microsoft issues, such as those related to Chromium. For a comprehensive overview of these updates, interested parties can visit the dedicated page for Windows Security Updates September 2025.
Windows Security Updates
For users of Windows 10 and Windows 11, the updates bring a variety of fixes and enhancements:
Windows 10 version 22H2
- Support Page: KB5065429
- Key Improvements: This update addresses an issue that led non-admin users to encounter User Account Control (UAC) prompts during certain actions with MSI installers and repairs. This was particularly relevant for users of Office Professional Plus 2010 and various Autodesk applications, including AutoCAD. Additionally, a WinSock-related issue has been resolved.
- For further changes, please refer to the optional update page.
Windows 11 version 22H2 / 23H2
- Support Page: KB5065431
- Key Improvements: Similar to the Windows 10 update, this version also rectifies the UAC prompt issue affecting non-admin users during MSI installer actions. The update includes fixes for Office Professional Plus 2010 and Autodesk applications, alongside a WinSock resolution.
- More details can be found on the optional update page.
Windows 11 version 24H2
- Support Page: KB5065426
- Key Improvements: This update resolves an input issue that caused certain applications to become unresponsive. It also addresses a bug that led to the disappearance of Internet Information Services (IIS) modules from IIS Manager, as well as a Network Device Interface (NDI) issue affecting audio in applications.
- For additional information, please check the optional update page.
It is worth noting that installing KB5063878 may lead to audio stuttering when Display Capture is enabled in OBS Studio.
Security advisories and updates
Among the updates, ADV 253991 provides guidance for secure Entra ID application authorization validation.
Microsoft Office Updates
For those seeking information on Office updates, details can be found on the designated Office update page.
How to download and install the September 2025 security updates
To install the updates promptly, follow these steps:
- Open the Start menu, type “Windows Update,” and select the corresponding result.
- Click on the “check for updates” button to initiate a manual update check.
- If updates do not download automatically, click on the “download & install all” button.
Direct update downloads
For those who prefer to download updates directly from the Microsoft Update Catalog, the following links are available:
Windows 10 version 22H2
- KB5065429 – 2025-09 Cumulative Update for Windows 10 Version 22H2
Windows 11 version 22H2
- KB5065431 – 2025-09 Cumulative Update for Windows 11 Version 22H2
Windows 11 version 23H2
- KB5065431 – 2025-09 Cumulative Update for Windows 11 Version 23H2
Windows 11 version 24H2
- KB5065426 – 2025-09 Cumulative Update for Windows 11 Version 24H2
Additional resources
As a reminder, Windows 10 will reach its end of life in just 30 days, on October 14, 2025. Users seeking to extend their security updates for an additional year can refer to the provided guide.
