Microsoft Windows Server 2025 Update Version OS Build 26100.32236

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Update Summary

KB5078135 updates Windows Server 2025 to OS Build 26100.32236. This cumulative out-of-band update includes prior security fixes plus a file system fix for apps hanging or erroring when using cloud storage such as OneDrive or Dropbox.

Update Details

Security

  • Includes security fixes from the January 13, 2026 security update (KB5073379) and the January 17, 2026 out-of-band update (KB5077793).
  • WSUS synchronization error details are temporarily removed to address Remote Code Execution vulnerability CVE-2025-59287.

Bug Fixes

  • Fixed an issue where some applications became unresponsive or returned unexpected errors when opening or saving files from cloud-based storage such as OneDrive or Dropbox.
  • Fixed an issue where Outlook could hang when PST files were stored on OneDrive, and users might see missing sent items or previously downloaded emails being re-downloaded.

Known Issues

  • After installing KB5070881 or later updates, WSUS does not display synchronization error details in its error reporting.

Hints

  • This update is cumulative; devices with earlier updates installed will download and install only the new changes in this package.
  • Includes servicing stack update KB5072725 for Windows Server 2025 (OS Build 26100.32131).
Product Information

Vendor: Microsoft

Product: Windows Server 2025

Version: OS Build 26100.32236

Release date: Jan 24, 2026

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