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Microsoft WSUS Patch Disrupts Hotpatching on Windows Server 2025

Microsoft WSUS Patch Disrupts Hotpatching on Windows Server 2025

First seen 4 Nov 2025, 11:10 UTC

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ThreatCluster AI
ThreatCluster March 12, 2026 at 13:27 UTC

A recent security update for the Windows Server Update Service (WSUS) has caused hotpatching functionality to fail on Windows Server 2025. This issue affects users who rely on hotpatching for seamless updates without requiring a full system reboot. The patch aimed to address a security vulnerability but inadvertently introduced this new problem.

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