Microsoft released an out‑of‑band (OOB) cumulative update for Windows 11, version 23H2 — KB5077797 (OS Build 22631.6494) — on January 17, 2026 to address two high‑impact regressions introduced by the January 13, 2026 cumulative update (KB5073455): Remote Desktop sign‑in failures and a Secure...
A patch released in January 2026 is causing some Windows 11 PCs to restart when users try to shut them down or put them to sleep, and Microsoft has published an emergency workaround while it works on a permanent fix. Background / Overview
Microsoft shipped its January cumulative updates on...
KB5073454 — Safe OS Dynamic Update for Windows 11 (23H2) — January 13, 2026
A WindowsForum-style technical guide, background, deployment checklist and step‑by‑step instructions for end users and administrators
Summary
KB5073454 (published January 13, 2026) is a Safe OS Dynamic Update that...