Microsoft Windows Server 2025 Update Version OS Build 26100.32234

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Update Summary

KB5077793 is an out-of-band cumulative update for Windows Server 2025 (OS Build 26100.32234). It includes January 13, 2026 security update KB5073379 content plus a fix for Remote Desktop sign-in failures after that update. Reference IDs: KB5072725, CVE-2025-59287, KB5078135.

Update Details

Security

  • Includes security fixes and improvements from the January 13, 2026 security update KB5073379.
  • WSUS synchronization error details are temporarily removed to address the Remote Code Execution vulnerability CVE-2025-59287.

Bug Fixes

  • Fixed Remote Desktop sign-in failures that occurred after installing the January 2026 Windows security update KB5073379.

Known Issues

  • WSUS does not display synchronization error details in error reporting after installing KB5070881 or later updates.
  • Some apps may become unresponsive or show errors when opening or saving files to cloud-based storage such as OneDrive or Dropbox.
  • Outlook may hang when PST files are stored on OneDrive, and sent items or previously downloaded emails may be missing or re-downloaded.

Hints

  • This update is cumulative; devices with earlier updates installed will download only the new content in this package.
  • The servicing stack update KB5072725 (OS Build 26100.32131) is included.
  • The cloud-storage app issue is addressed in KB5078135.
Product Information

Vendor: Microsoft

Product: Windows Server 2025

Version: OS Build 26100.32234

Release date: Jan 17, 2026

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