Microsoft's September 2026 security roundup adds a Security Copilot detonation summary to Microsoft Defender for Office 365 and network-level data loss prevention (DLP) through Microsoft Purview and Microsoft Entra Global Secure Access. Purview also gains larger auto-labeling simulations, eDiscovery support for user-owned SharePoint Embedded containers, file-level archiving, and permanent deletion with Priority Cleanup. In addition, Intune Remote Help, Enterprise Application Management, and Microsoft Cloud PKI are coming to GCC High. This article explains the requirements, configuration steps, and limitations of each feature.

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Microsoft’s emergency KB5129195 update only partly repairs the USB Audio Class 1.0 failures introduced by September’s Patch Tuesday release. Systems that previously lost audio or showed Code 10 errors may still be affected, while the new patch mainly restores eight-channel and 3D audio operation.

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Microsoft has published a temporary workaround for Windows 11 domain login failures caused by September 2026 updates, including KB5124008. The guidance follows reports that the update broke domain trust through Machine Identity Isolation, an issue covered in reports about KB5124008 breaking domain trust and the failure of emergency updates to fix secure domain logins.

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