Microsoft Windows 11 26H2 Update Version OS Build 26300.9711

KB5127648 updates Windows 11 26H2 to build 26300.9711 with security improvements, Secure Boot certificate deployment, ReFS security controls, and fixes for Explorer, VPN, Storage Spaces, printing, audio, and Windows Hello.

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Product Information

Vendor: Microsoft

Product: Windows 11

Product type: Software

Application category: Utilities

Platform: Windows

Variant: 26H2

Version: OS Build 26300.9711

Vendor information published: 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.