kb5071546

The kb5071546 tag covers the December 2025 cumulative update for Windows 10 Extended Security Updates (ESU), advancing eligible systems to Build 19045.6691 / 19044.6691. This rollup packages the November fixes and includes a security-focused tweak to PowerShell 5.1. Available through Windows Update for ESU-enrolled devices and as offline .msu packages in the Microsoft Update Catalog, the update contains an across-the-board security package that remediation and incident-response teams should prioritize for ESU-covered Windows 10 endpoints. No user-facing features beyond the PowerShell change are included.