Microsoft: Sept Windows Server updates cause Active Directory issues
ID: 5be07c4b-fac6-53ee-b15f-4c7bacb19d8f
STIX ID: report--5be07c4b-fac6-53ee-b15f-4c7bacb19d8f
Feed Name: Bleeping Computer
Threat Score
Microsoft confirmed that the September 2025 Windows security update (KB5065426) is causing Active Directory synchronization failures on Windows Server 2025, which can lead to incomplete Microsoft Entra Connect Sync for large AD security groups; Microsoft provided a registry workaround (adding a REG_DWORD under FeatureManagement\Overrides) and is working on a permanent fix while warning administrators about registry risks.
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