Microsoft has released out-of-band updates for Windows 11 versions 26H1, 25H2, and 24H2 to address security vulnerabilities and improve system performance. The KB5129194 patch for version 26H1 fixes a critical elevation-of-privilege vulnerability (CVE-2026-62721) related to the Windows User-Mode Power Service (UMPS). The KB5129195 update for versions 25H2 and 24H2 also addresses a similar UMPS vulnerability and resolves a connection issue with Remote Desktop Services. Additionally, the updates fix problems with multichannel audio features on certain USB Audio Class 1.0 devices. These updates include enhancements from the September 2026 Patch Tuesday release, such as Taskbar customization, a faster Windows Search experience, and new Start Menu options. Users with unmanaged PCs will receive these updates automatically but can also check for updates manually.