Windows Server 2022 KB5129237
Windows Server 2022 build 20348.5631 (KB5129237) is an out-of-band cumulative update released to address issues following the September 2026 security update. Most notably, it resolves a Remote Desktop Services issue that could cause RDS instability, RDP connection and sign-in failures, server unresponsiveness, and related management tools to stop responding. The update includes the fixes and improvements from the September 8 cumulative update KB5122882.
What's new
Microsoft Windows Server 2022 build 20348.5631 (KB5129237) is an out-of-band cumulative update released following the September 2026 security update.
What's new- Fixes a Remote Desktop Services issue that could cause RDS to become unstable after the September 2026 security update.
- Resolves RDP connection and sign-in failures in affected environments.
- Addresses cases where servers could become unresponsive during Remote Desktop configuration.
- Resolves related issues affecting components such as Microsoft Management Console (MMC), RDS Licensing Diagnoser, and File Explorer.
- Includes the fixes and improvements previously released with KB5122882 (OS Build 20348.5622).
- Includes servicing stack improvements to improve Windows Update reliability.
- Some USB Audio Class 1.0 devices may fail to start, produce no audio, display Device Manager Code 10, or have unavailable volume controls.
- WSUS may not display synchronization error details following KB5070884 or later updates while Microsoft addresses CVE-2025-59287.
Organizations affected by Remote Desktop Services instability after the September 2026 security update should prioritize deployment of KB5129237 after expedited validation. This update is particularly important for Windows Server 2022 environments that rely heavily on RDP or Remote Desktop Services.
π¬ Comments (0)
Share any installation issues, compatibility changes, or fixes you noticed.