Microsoft has released Windows 11 KB5065426 and KB5065431 cumulative updates for versions 24H2 and 23H2 to fix security vulnerabilities and issues.
Today's updates are mandatory as they contain the September 2025 Patch Tuesday security patches for vulnerabilities discovered in previous months.
You can install today's update by going to Start > Settings > Windows Update and clicking on 'Check for Updates.'
Windows Update (KB5065426)
You can also manually download and install the update from the Microsoft Update Catalog.
If you use Windows 11 Enterprise or Windows Server with Hotpatch, you'll see KB5065474 and it includes the same set of fixes, but the build number is 26100.6508.
What's new in the September 2025 Patch Tuesday update
After installing today's security updates, Windows 11 24H2 (KB5065426 ) will have its build number changed to Build 26100.6584, and 23H2 (KB5065431) will be changed to 226x1.5909.
In case of Windows 11 23H2, Microsoft warned that support for 23H2 ends on November 11, 2025. You'll be either force upgraded to 24H2 or stop receiving updates after the deadline.
Here's the full list of improvements:
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