Windows updates matched to version, build and known-issue state.
Use the KB number and OS build together. A symptom reported after an update is not proof that the update caused it, and later updates can change the correct resolution.
August 11, 2026 Windows 11 security update
The August 2026 security update for Windows 11 25H2 and 24H2. Release-health history links it to an ARM Teams/new Outlook launch issue, while a reported game-unresponsiveness cluster was later determined to be associated with RGB-related third-party drivers/components rather than Windows Update itself.
Released; several reported issues later resolved or reclassified →2026-08-27 · Optional preview cumulative updateKB5120998August 27, 2026 Windows 11 preview update
An optional preview cumulative update that later appeared in release-health history for desktop-background and mouse-personalization regressions on affected systems.
Released; documented personalization issues resolved by later update →2026-09-14 · Out-of-band cumulative updateKB5129195September 14, 2026 Windows 11 out-of-band update
A cumulative out-of-band follow-up to the September security update. It is especially relevant when troubleshooting documented RDS instability, Plan9 host-folder sharing, or multichannel USB-audio failures introduced around the September update cycle.
Released; resolves several September known issues →2026-09-08 · Security cumulative updateKB5124008September 8, 2026 Windows 11 security update
The September 2026 security cumulative update for Windows 11 25H2 and 24H2. Its Microsoft support record documents several post-release issues and later resolution changes, which makes build and symptom matching important before troubleshooting.
Released; follow-up OOB update available for several known issues →winver or open Settings > System > About and verify the installed Windows version/build.