KB5136489: Overview with user sentiment and feedback
Last Updated November 14, 2026
Probability of successful installation and continued operation of the machine
Overview
KB5136489 is a non-security out-of-band cumulative update for Windows Server 2025 (OS Build 26100.33828), released November 13, 2026. It builds on KB5131080 from November 10, 2026. It is aimed at licensing and activation problems introduced by the prior Patch Tuesday release. Installation requires the SSU 26100.2032 or later and the checkpoint cumulative update KB5043080.
General Purpose
- Fixes Software Licensing Management Tool (slmgr) operations failing with error 0x80041008, which affected KMS activation setup and product key installation.
- Devices already activated stay activated, and devices without extra slmgr.vbs steps were unaffected.
- Includes servicing stack update KB5131079 (26100.33822).
- Install the checkpoint KB5043080 MSU before the target MSU, or use DISM to install both from one folder.
- When slipstreaming into installation media, include boot.stl to avoid error 0xc0430001.
General Sentiment
Enterprise administrators who automate activation with slmgr were disrupted by the prior Patch Tuesday release, and this update is aimed directly at that problem. Community discussion is limited to a small set of threads. No new breakage tied to this release has been widely reported.
Known Issues
- WSUS does not display synchronization error details after installing KB5070881 or later; this is temporarily removed to address CVE-2025-59287.
Disclaimer: We take measures to ensure that AI-generated content is of the highest possible quality, but we cannot guarantee its accuracy and recommend that users do their own independent research. Generated on 2026-11-14 07:19 AM
