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Microsoft Windows KB5083769 VSS backup disruption

Service Disruption
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Last updated
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1 unique sources, 1 articles

Summary

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The April 2026 KB5083769 security update is breaking third-party backup applications on Windows 11 24H2 and 25H2, disrupting snapshot-based protection and affecting multiple vendors. The failure is tied to Microsoft VSS timeouts during snapshot creation, which can stop backup jobs from completing. In some cases, affected systems may also lose cloud console connectivity and appear offline. A temporary workaround is to remove KB5083769 and pause updates until the issue is fixed.

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Timeline

  1. 30.04.2026 18:23 2 articles · 27d ago

    KB5083769 disrupts VSS-based backups on Windows 11

    Initial Disclosure

    The April 2026 KB5083769 security update is breaking third-party backup applications on Windows 11 24H2 and 25H2 by causing Microsoft VSS snapshot operations to time out, affecting products such as Acronis Cyber Protect Cloud, Macrium Reflect, NinjaOne Backup, and UrBackup Server. Affected systems can fail backup jobs and, in some cases, lose connectivity with the cloud console and appear offline; a temporary workaround is to uninstall KB5083769, pause Windows updates, and reboot.

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