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
Product type: Software
Application category: Utilities
Platform: Windows
Version: OS Build 26100.32236
Vendor information published: Jan 24, 2026
Original release notes: View on vendor site
Published on updatealert.io: Jun 3, 2026
Description: Server operating system for next-generation on-premises and hybrid workloads.