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Microsoft Security Update Causes Active Directory Sync Failures on Windows Server 2025

Microsoft has identified a synchronization issue affecting Active Directory environments on Windows Server 2025, following the release of recent security updates.

SBy Sean AveryOct 16, 20251 min read

Microsoft has identified a synchronization issue affecting Active Directory environments on Windows Server 2025, following the release of recent security updates.

As of Mon, Oct 14, 2025, the issue is known to disrupt directory synchronization for large security groups, impacting identity management processes within enterprise networks.

The problem originates from the September 2025 Windows security update, KB5065426, which is applicable to OS Build 26100.6584. This update affects applications dependent on Active Directory synchronization controls, such as Microsoft Entra Connect Sync, which fail to fully replicate Active Directory security groups exceeding 10,000 members.

The incomplete synchronization occurs exclusively on Windows Server 2025 after applying the update. Microsoft initiated an investigation on Oct 14 and confirmed the issue's scope.

The problem originates from the September 2025 Windows security update, KB5065426, which is applicable to OS Build 26100.6584.
Sean Avery · Thehackingpost

The flaw affects on-premises Active Directory Domain Services (AD DS), integral to hybrid cloud environments that integrate Entra ID with local directories. Organizations in sectors like finance, healthcare, and government, which maintain extensive user bases, may experience challenges.

Issues arising from incomplete group synchronization include access denials, compliance risks, and operational downtime due to lost permissions for shared resources. The issue underscores challenges in maintaining secure server architectures, particularly as Windows Server 2025 is a recent release, limiting rollback options.

Administrators can temporarily mitigate the issue by modifying the registry to disable the problematic feature. This involves creating a DWORD value named 2362988687 and setting it to 0. Caution is advised during registry modifications to prevent potential system issues.

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Microsoft is actively working on a resolution to be included in a future Windows update. The impact is limited to server environments, with no client platforms affected. IT teams should refer to Microsoft's security update guide for the latest information and consider the registry fix against ongoing threats.

Organizations are advised to test updates in staging environments before full deployment to balance security with operational stability.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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