KB5086672 (OS builds 26200.8117 and 26100.8117) is an out-of-band hotpatch update that is being delivered through Windows Update to devices on the Windows Insider Release Preview Channel.
Like other recent out-of-band and cumulative updates for builds 26100/26200, it is obtained via the standard Windows Update mechanism. When checking for updates on a device configured for the Release Preview Channel, Windows Update will automatically download and install the update when it is offered for that device.
These out-of-band and hotpatch releases include the latest servicing stack update (SSU) bundled with the update, following the same servicing model as earlier 26100/26200 updates.
References:
- March 16, 2026—Hotpatch KB5084897 (OS Builds 26200.7984 and 26100.7984) Out-of-band
- January 24, 2026—Hotpatch KB5078167 (OS Builds 26200.7634 and 26100.7634) Out-of-band
- March 11, 2025—KB5053598 (OS Build 26100.3476)
- October 23, 2025—KB5070881 (OS Build 26100.6905) Out-of-band
- My system has been on RP channel why is it downloading a Beta release? - Microsoft Q&A
- Release Preview channel seems to be missing - Microsoft Q&A
- Problem updating to the latest preview insider channel build - Microsoft Q&A
- Any Updates from windows 11 release preview 26220.6690 - Microsoft Q&A
- device missing important security and quality issues - Microsoft Q&A