Story perspectives

Microsoft April Update Causes Reboot Cycles in Servers

4/18/2026

Summary

Story summary

Microsoft Corporation's April 2026 security update KB5082063 causes continuous reboot cycles on domain controllers.
The update affects non-Global Catalog domain controllers in Privileged Access Management environments.
Local Security Authority Subsystem Service crashes disrupt Active Directory authentication and directory services.
Five Windows Server versions are affected, including 2016, 2019, 2022, and 2025.
Microsoft has not released a permanent fix, prompting administrators to seek mitigation guidance from Microsoft Support for Business.

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Story summary

Microsoft Corporation's April 2026 security update KB5082063 causes continuous reboot cycles on domain controllers.
The update affects non-Global Catalog domain controllers in Privileged Access Management environments.
Local Security Authority Subsystem Service crashes disrupt Active Directory authentication and directory services.
Five Windows Server versions are affected, including 2016, 2019, 2022, and 2025.
Microsoft has not released a permanent fix, prompting administrators to seek mitigation guidance from Microsoft Support for Business.