Microsoft Windows 11 26H1 Update Version OS Build 28000.1719
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Update Summary
KB5079466 updates Windows 11, version 26H1 to OS Build 28000.1719 with security improvements and non-security fixes from the February preview release. It also improves Secure Boot certificate targeting, WDAC COM object allowlisting, and Windows System Image Manager catalog trust handling. Reference IDs: KB5077239, KB5078262.
Update Details
Security
- Secure Boot: expands high-confidence device targeting data for automatic delivery of new Secure Boot certificates in a controlled, phased rollout.
- Windows Defender Application Control (WDAC): fixes COM objects being blocked when the endpoint security policy was set higher than the allowlisting policy.
Bug Fixes
- Windows System Image Manager: improves reliability when choosing trusted catalog files and adds a warning dialog to confirm the file comes from a trusted source.
Hints
- Includes fixes and quality improvements from KB5077239.
- If previous updates are already installed, only the new updates in this package will be downloaded and installed.
- Windows 11 servicing stack update (KB5078262) is included for OS Build 28000.1638.
- AI components updated: Image Search, Content Extraction, Semantic Analysis, and Settings Model to version 1.2601.1268.0.
Product Information
Vendor: Microsoft
Product: Windows 11
Product type: Software
Application category: Utilities
Platform: Windows
Variant: 26H1
Version: OS Build 28000.1719
Vendor release date: Mar 10, 2026
Original release notes: View on vendor site
Published on updatealert.io: Jun 3, 2026
Description: Client operating system for modern desktop and enterprise environments.