Microsoft Windows 11 26H1 Update Version OS Build 28000.1836

KB5083768 updates Windows 11, version 26H1 with the latest security improvements and non-security fixes from KB5079466. It adds Secure Boot status visibility, improves SMB compression over QUIC, and strengthens phishing protection for Remote Desktop (.rdp) files. Reference IDs: KB5088834, KB5083806.

• Adds stronger phishing protection for Remote Desktop (.rdp) files by showing all requested connection settings before connecting and turning them off by default.
• Improves Secure Boot certificate rollout and status visibility in Windows Security.
• Fixes an issue where a device might enter BitLocker Recovery after Secure Boot updates.

• Improves reliability when Windows uses SMB compression over QUIC, reducing timeouts.
• Includes quality improvements from KB5079466.
• Updates the servicing stack with KB5088834 to improve update installation reliability.

• Shows Secure Boot certificate update status in the Windows Security app with badges and notifications.
• Adds additional high-confidence device targeting data to expand automatic Secure Boot certificate rollout coverage.

• Remote Desktop security warnings might not display correctly in some cases, especially on multi-monitor setups with different display scaling settings.

• Secure Boot status alerts are disabled by default on commercial devices.
• If previous updates are already installed, only the new updates in this package will be downloaded and installed.
• The Remote Desktop warning display issue is addressed in KB5083806.

Product Information

Vendor: Microsoft

Product: Windows 11

Version: OS Build 28000.1836

Release date: Apr 14, 2026