Microsoft Windows 11 23H2 Update Version OS Build 22631.7584
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Update Summary
KB5129242 for Windows 11, version 23H2 is an out-of-band cumulative update for OS Build 22631.7584. It includes security fixes from KB5122880 plus fixes for Remote Desktop Services, Hyper-V Plan9 folder sharing, and USB Audio Class 1.0 multichannel audio. Reference IDs: KB5122879.
Update Details
Security
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Bug Fixes
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Known Issues
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Hints
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Product Information
Vendor: Microsoft
Product: Windows 11
Product type: Software
Application category: Utilities
Platform: Windows
Variant: 23H2
Version: OS Build 22631.7584
Vendor information published: Sep 14, 2026
Original release notes: View on vendor site
Published on updatealert.io: Sep 17, 2026
Description: Client operating system for modern desktop and enterprise environments.