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Windows Server 2022 Windows Server 2022 Out-of-band update
Out-of-band

KB5078136

KB5078136: Cumulative update for Windows Server, version 2022, January 2026. Cloud-file errors and Outlook hangs get a fix

In short

Apps that open or save files in cloud storage might stop responding after the January 13 update. This out-of-band update fixes that problem, including hangs in some Outlook setups.

Does it affect you? Applies to: Devices running Windows Server 2022, x64.

Build
20348.4651
Restart
Required
Review notes Additional details from the official release notes (5) Read notes
  • In detail The update fixes the reported issue affecting some applications that open or save files in cloud storage after the January 13 update.
  • What changes The update fixes the reported issue affecting some applications that open or save files in cloud storage after the January 13 update.
  • What changes This cumulative update includes security fixes and improvements from KB5073457 and KB5077800, as well as the file-system fix described here.
  • In detail WSUS synchronization error details are temporarily unavailable to address the remote code execution vulnerability CVE-2025-59287.
  • Known issues WSUS synchronization error details are temporarily unavailable to address the remote code execution vulnerability CVE-2025-59287.

The official sources are linked at the end of the page.

What changes

Fix 1 change

File System

For: Some apps and Outlook setups using cloud storage

  • Apps can open and save cloud files again without the errors or hangs reported after the January 13 update.1
    Fixes problems opening or saving files in cloud storage such as OneDrive or Dropbox. In some Outlook setups with PST files on OneDrive, Outlook might hang, fail to reopen, or show missing sent items or re-downloaded email.

Improvement 1 change

Servicing stack

For: Windows Server 2022 devices

  • The component that installs Windows updates gets quality improvements.2
    Includes servicing stack update KB5074428, build 20348.4640.

Known issues

  1. Open Affects: Organizations and IT administrators

    Windows Server Update Services (WSUS) does not display error details

    WSUS does not show synchronization error details after KB5070884 or later updates. Microsoft temporarily removed this feature to address CVE-2025-59287.3

    Workaround status No workaround yet

    Microsoft has not published a manual workaround for this issue yet. Monitor release health until a resolving update is available.

  2. Open Affects: Everyone

    Some devices with Virtual Secure Mode enabled might fail to shut down or hibernate

    Some Secure Launch-capable PCs with Virtual Secure Mode enabled might restart instead of shutting down or entering hibernation.4

    How to apply the workaround Workaround

    Install KB5075906; Microsoft says it addresses this issue.4

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2026-01-24
Classification
Updates
Type
Cumulative update
Restart
Required
Replaces
KB5077800, KB5073457, KB5071547, KB5068787
+30 earlier KB5070884, KB5066782, KB5065432, KB5063880, KB5062572, KB5060526, KB5061906, KB5058385, KB5059092, KB5058920, KB5055526, KB5053603, KB5051979, KB5052819, KB5049983, KB5048654, KB5046616, KB5047767, KB5044281, KB5042881, KB5041160, KB5040437, KB5041054, KB5039227, KB5037782, KB5036909, KB5037422, KB5035857, KB5034770, KB5034129
Replaced by
KB5075906
VersionBuildChannel
2022 20348.4651 General availability

Security

No vulnerabilities are listed for this update.

Downloads (Microsoft Update Catalog)

x64 2022
413.6 MB
windows10.0-kb5078136-x64.msu Main update · KB5078136 SHA-1: a5075e17…27c217

Updated components

13 files changed since the previous update for the same versions.

Sources

Updated
Cited passages from Microsoft's official notes (4)
  1. 1. Fixed: After installing the Windows update released on and after January 13, 2026, some applications became unresponsive or encountered unexpected errors when opening files from or saving files to cloud-based storage support.microsoft.com
  2. 2. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. support.microsoft.com
  3. 3. This functionality is temporarily removed to address the Remote Code Execution Vulnerability, CVE-2025-59287. support.microsoft.com
  4. 4. After installing this update, some Secure Launch-capable PCs with Virtual Secure Mode (VSM) enabled are unable to shut down or enter hibernation. Instead, the device restarts. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 4 quoted passages · compared with Microsoft's page on Sep 25, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 3/5, clarity 4/5, completeness 3/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake