kb5089466

KB5089466 is a hotpatch update released by Microsoft in May 2026 for Windows 11 Enterprise versions 25H2 and 24H2. It moves eligible systems to OS builds 26200.8390 and 26100.8390, delivering security improvements along with fixes for SSDP reliability and a Remote Desktop warning-dialog rendering bug. This update reflects Microsoft's ongoing effort to normalize reboot-light patching as an enterprise operating model. For administrators, maintaining hotpatch eligibility and observability is key to keeping deployments stable and predictable.