The Update BureauKB5077793: Cumulative update for Windows Server, version 2025, January 2026. Remote Desktop sign-in failures fixed
Remote Desktop connections work again for users who had sign-in failures after the January security update. The update also includes a servicing stack improvement.
Does it affect you? Applies to: Devices running Windows Server 2025, x64.
What changes
Fix 1 change
Remote Desktop
For: users of Remote Desktop applications
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Some users who could not sign in to Remote Desktop connections can sign in again.1
Fixes sign-in failures during authentication in different Remote Desktop applications on Windows, including Windows App, after KB5073379.
Improvement 1 change
Servicing stack
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The component that installs Windows updates gets quality improvements.2
Includes servicing stack update KB5072725, build 26100.32131.
Known issues
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Windows Server Update Services (WSUS) does not display error details
WSUS does not show synchronization error details. Microsoft says this functionality is temporarily removed to address CVE-2025-59287.3
Workaround status No workaround yetMicrosoft has not published a manual workaround for this issue yet. Monitor release health until a resolving update is available.
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Apps might become unresponsive when saving files to cloud-based storage
Some apps might hang or show errors when opening or saving files in cloud storage. Microsoft lists this issue for this update and identifies KB5078135 as addressing it.4
Workaround status No workaround yetMicrosoft has not published a manual workaround for this issue yet. Monitor release health until a resolving update is available.
Technical details
Data sheet · Security · Downloads · Components Click to collapse or expand
Data sheet
- Released
- 2026-01-17
- Classification
- Updates
- Type
- Cumulative update
- Restart
- Required
- Replaces
- KB5073379, KB5072033, KB5072359, KB5068861
- Replaced by
- KB5078135
| Version | Build | Channel |
|---|---|---|
| 2025 | 26100.32234 | General availability |
Security
No vulnerabilities are listed for this update.
Downloads (Microsoft Update Catalog)
Updated components
467 files changed since the previous update for the same versions.
| Top changed components | Files |
|---|---|
| Graphics and display | 11 |
| Audio | 7 |
| File Explorer and shell | 4 |
| Networking | 4 |
| Hyper-V and virtualization | 2 |
| Kernel | 2 |
| Printing | 1 |
| Secure Boot | 1 |
| Settings | 1 |
Sources
Cited passages from Microsoft's official notes (4)
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1.
Fixed: After installing the January 2026 Windows security update (KB5073379), some users experienced sign-in failures during Remote Desktop connections.
support.microsoft.com -
2.
This update makes quality improvements to the servicing stack, which is the component that installs Windows updates.
support.microsoft.com -
3.
After installing KB5070881 or later updates, Windows Server Update Services (WSUS) does not display synchronization error details within its error reporting.
support.microsoft.com -
4.
After installing this update, some applications may become unresponsive or encounter unexpected errors when opening files from or saving files to cloud-based storage, such as OneDrive or Dropbox.
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 5/5, clarity 4/5, completeness 4/5. 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