Microsoft Windows 11 26H1 Update Version OS Build 28000.3231
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Update Summary
KB5127646 updates Windows 11 version 26H1 to OS Build 28000.3231 with security improvements, Secure Boot certificate deployment enhancements, ReFS auditing controls, and fixes for Explorer, VPN, Storage Spaces Direct, and gaming issues.
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: 26H1
Version: OS Build 28000.3231
Release date: Oct 13, 2026
Original release notes: View on vendor site
Published on updatealert.io: Oct 14, 2026
Description: Client operating system for modern desktop and enterprise environments.