{"family":"windows11","family_label":"Windows 11","build":"26100.9550","base":"26100","tag":"24H2","kb":"KB5124010","kb_url":"https://support.microsoft.com/help/5124010","kb_title":"September 22, 2026—KB5124010 (OS Builds 26200.9550 and 26100.9550) Preview","release_date":"2026-09-22","update_type":"2026-09 D","update_type_label":"Optional preview update","servicing":"LTSC • General Availability Channel","ms_known_issues":[{"title":null,"symptom":"After installing the September 8, 2026, Windows security update ( KB5124008 ), or later updates, some Credential Guard protected machine accounts might lose their secure channel with an on-premises Active Directory (AD) domain. Users might then be unable to sign in interactively with valid domain credentials and might receive a message stating that the trust relationship between the device and the domain failed. Offline sign-in using previously cached credentials might continue to work. AD replication and AD services on the domain controllers are not affected. This issue occurs because KB5124008 and later updates enable the Machine Identity Isolation feature. While the update does not direct","workaround":"Important: This section contains information about modifying the registry. Before you modify the registry, back it up and make sure that you know how to restore it if a problem occurs. For more information, see How to back up and restore the registry in Windows . To work around this issue, disable Machine Identity Isolation using the same management method that was used to enable it. Choose the applicable option below: If Machine Identity Isolation was enabled by Intune policy, disable Machine Identity Isolation with Intune . If Machine Identity Isolation was enabled by Intune policy, disable Machine Identity Isolation with Intune . If Machine Identity Isolation was enabled by Group Policy,","applies_to":"","status":""}],"ms_none_known":false,"ms_highlights":"This update is available through two release phases: gradual rollout and normal rollout. A gradual rollout delivers an update in phases, so features reach devices over time instead of all at once, meaning availability varies by device. A normal rollout is the broad release to all eligible devices at the same time, usually when it reaches general availability (GA). Note If you installed earlier updates, your device downloads and installs only the new updates contained in this package. [File Explorer] New! This update adjusts how the preview pane handles files downloaded from the web. For HTML files, a new Preview anyway button lets you acknowledge the warning and preview the file. Non-HTML files, such as PDFs, are now previewed automatically. New! File Explorer Home now preserves the state of sections (expanded or collapsed), so you can pick up where you left off. New! This update improves the reliability of thumbnail previews for cloud files in the Details pane. The pane has also been reorganized so file properties are easier to find and review at a glance. New! 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