We typically share updates on Windows Security as soon as they become available. Although this update is slightly delayed, we are pleased to bring it to you now.
Microsoft Windows Security Updates: September 2025
Overview
Microsoft has issued a total of 86 security updates for its products, which includes 9 classified as critical and 72 important. Additionally, 5 patches have been rolled out to address non-Microsoft vulnerabilities, including those related to Chromium.
For comprehensive details about the updates, please visit the following link: Windows Security Updates September 2025.
Known Issues in Windows Clients
- Windows 10: No known issues reported.
- Windows 11: Version 24H2 is experiencing failures in PowerShell Direct (PSDirect) connections on hotpatched devices.
- Windows Server: Identified issues in Windows Server 2008, 2022, and 2025.
Detailed Windows Security Updates
1. Windows 10 Version 22H2
- Support Page: KB5065429
- Update includes important security fixes and improvements.
- Resolved an issue where non-admin users encountered UAC prompts during specific MSI installer actions affecting Office Professional Plus 2010 and Autodesk applications such as AutoCAD. A WinSock-related issue has also been addressed.
- More information can be found on the optional update page.
2. Windows 11 Version 22H2 / 23H2
- Support Page: KB5065431
- This update also fixes an issue that affected non-admin users encountering UAC prompts during specific MSI installer actions, similar to Windows 10, while rectifying an issue tied to WinSock.
- Refer to the optional update page for further modifications.
3. Windows 11 Version 24H2
- Support page: KB5065426
- Significant improvements include solving an input issue causing app unresponsiveness and fixing a bug related to disappearing IIS modules. Audio issues affecting apps due to a Network Device Interface (NDI) bug have also been rectified.
- For more details, consult the optional update page.
Note: Installing KB5063878 may lead to audio stuttering in OBS Studio when Display Capture is active.
Important Security Vulnerabilities Addressed
Security Advisories and Updates
For more information, refer to ADV 253991, which provides guidance regarding secure Entra ID application authorization validation.
Microsoft Office Updates
Installing the September 2025 Security Updates
To update your system immediately, follow these steps:
- Launch the Start menu, type ‘Windows Update’, and select this option.
- Click the “Check for updates”button to manually check for available updates.
- If updates do not download automatically, click the “Download & install all”button.
Direct Update Downloads
If you prefer to download updates directly from the Microsoft Update Catalog, use the following links:
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
Release notes for August 2025 Security Updates List of software updates for Microsoft products Latest Windows Updates and Services Packs Security Updates Guide Microsoft Update Catalog site In-depth Windows update guide Installing optional updates on Windows 10: A guide Windows 11 24H2 Update History Windows 11 23H2 Update History Windows 10 Update History
Please note that Windows 10 will reach the end of its support lifecycle in just 30 days, on October 14, 2025.
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