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

Version: OS Build 28000.1719

Release date: Mar 10, 2026

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