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Windows Server 2025 Windows Server 2025 Out-of-band update
Out-of-band

KB5136489

KB5136489: Cumulative update for Windows Server, version 2025, November 2026. Fix addresses certain Windows licensing failures with error 0x80041008

In short

Some organizations can now complete certain Windows licensing and activation operations that previously failed. The fix mainly helps systems that use commands or automated processes to manage KMS activation and product keys.

Does it affect you? Applies to: Devices running Windows Server 2025, with the update package listed for x64 systems.

Build
26100.33828
Restart
Required

What changes

Fix 1 change

Licensing and Activation

For: Organizations using licensing commands or automated processes

  • The update fixes certain Windows licensing and activation operations that could fail with error 0x80041008.1
    Fixes failures with error 0x80041008 (Invalid parameter) in certain operations using slmgr.vbs. The issue mainly affected organizations configuring Key Management Service (KMS) activation, installing product keys, or managing Windows licensing through commands or automated processes. Already activated devices and existing KMS configurations that needed no further slmgr.vbs commands were not affected.

Improvement 1 change

Servicing stack

  • The component that installs Windows updates gets quality improvements.2
    Includes servicing stack update KB5131079, version 26100.33822.

Known issues

  1. Open Affects: Organizations and IT administrators

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

    Windows Server Update Services (WSUS) does not show synchronization error details in its reports after KB5070881 or later updates.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.

Technical details

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

Data sheet

Released
2026-11-13
Classification
Updates
Type
Cumulative update
Restart
Required
Replaces
KB5131080, KB5134137, KB5126646, KB5129235
+33 earlier KB5122871, KB5120233, KB5099536, KB5094125, KB5087539, KB5091157, KB5082063, KB5078740, KB5075899, KB5078135, KB5077793, KB5073379, KB5072033, KB5072359, KB5068861, KB5070881, KB5070773, KB5066835, KB5068221, KB5065426, KB5063878, KB5064489, KB5062553, KB5060842, KB5058411, KB5055523, KB5053598, KB5051987, KB5050009, KB5048667, KB5046617, KB5044284, KB5043080
VersionBuildChannel
2025 26100.33828 General availability

Security

No vulnerabilities are listed for this update.

Updated components

1,498 files changed since the previous update for the same versions.

Top changed componentsFiles
Graphics and display12
Hyper-V and virtualization7
Remote Desktop7
Printing4
Secure Boot4
Bluetooth3
Emoji and input3
Kernel3
Networking3
Security and sign-in3
Search2
Settings2

Sources

Updated
Cited passages from Microsoft's official notes (3)
  1. 1. Fixed: An issue where certain Windows licensing and activation operations using the Software Licensing Management Tool (SLMGR) might fail with error 0x80041008 (Invalid parameter). 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. After installing KB5070881 or later updates, Windows Server Update Services (WSUS) does not display synchronization error details within its error reporting. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 3 quoted passages · compared with Microsoft's page on Nov 15, 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