Microsoft Windows 11 26H2 Update Version OS Build 26300.9725
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Update Summary
KB5134133 delivers an out-of-band cumulative update for Windows 11 version 26H2, including an updated trusted root certificate payload, AI component updates, and servicing reliability improvements.
Update Details
Security
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Bug Fixes
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New Features
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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: 26H2
Version: OS Build 26300.9725
Vendor information published: Oct 26, 2026
Original release notes: View on vendor site
Published on updatealert.io: Oct 30, 2026
Description: Client operating system for modern desktop and enterprise environments.