KB5123065: Overview with user sentiment and feedback
Last Updated October 24, 2026
Probability of successful installation and continued operation of the machine
Overview
KB5123065 is the September 8, 2026 Monthly Rollup cumulative security update for Windows Server 2012 (ESU). It carries Secure Boot certificate targeting updates and security fixes. The page is the Microsoft Support entry for this release, and it lists known issues that Microsoft has documented.
General Purpose
- Adds higher-confidence device targeting data so more eligible devices receive new Secure Boot certificates.
- Includes the September 2026 security fixes, detailed in the Security Update Guide.
- Requires the latest SSU (KB5123602) to be installed first, or the update may not install.
- Deployment to existing images needs boot.stl included on install media to avoid 0xc0430001 boot errors.
General Sentiment
Community discussion was not available in the provided data, so reception is based on Microsoft's documentation alone. The documented problems are significant enough to warrant caution, though the security content and Secure Boot changes are important to deploy.
Known Issues
- USB Audio Class 1.0 devices may show Code 10 or produce no audio; the September 14 OOB update fixes only the 8-channel/3D audio cases.
- Remote Desktop Services may become unstable or hang after installation; resolved in updates from September 14, 2026 (e.g., KB5129244).
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 2026-10-24 01:52 AM
