Microsoft released the January Patch Tuesday update on January 13, 2026, addressing over 110 security vulnerabilities. The update introduced bugs affecting Windows 11, Windows 10, and Windows Server.
The first issue involves authentication failures when connecting to a Cloud PC via Remote Desktop, primarily affecting Windows 11 25H2, Windows 10 22H2 ESU, and Windows Server 2025.
The second issue affects systems with Secure Launch enabled, causing unexpected restarts instead of shutting down or entering hibernation mode, specifically impacting Windows 11 23H2.
Microsoft has released emergency patches for the affected versions, which include:
- Windows 11, versions 25H2 and 24H2 (KB5077744)
- Windows 11, version 23H2 (KB5077797)
- Windows 10, version 22H2 ESU and Windows 10 Enterprise LTSC 2021 (KB5077796)
- Windows Server 2025 (KB5077793)
- Windows Server 2022 (KB5077800)
- Windows Server 2019 and Enterprise LTSC 2019 (KB5077795)