The April 2026 KB5083769 safety replace breaks third-party backup packages from more than one distributors on methods working Home windows 11 24H2 and 25H2.
In line with person studies, first noticed by means of Microsoft MVP Susan Bradley, this factor impacts tool the use of VSS (Quantity Shadow Reproduction Provider) snapshots and reasons disasters because of a VSS provider timeout.
Microsoft VSS was once offered in Home windows Server 2003 and is helping make certain that the working components, backup tool, and industry apps (reminiscent of SQL Server and Change) paintings in combination extra successfully. VSS could also be utilized by Home windows options and packages like Home windows Server Backup, Device Heart Knowledge Coverage Supervisor, and Device Repair.
The checklist of tool impacted by means of this recognized factor comprises, however isn’t restricted to, merchandise from Acronis (Cyber Offer protection to Cloud), Macrium (Mirror), NinjaOne Backup, and UrBackup Server.
Acronis has additionally printed a fortify record confirming that the problem impacts Home windows 11 Professional and House editions, inflicting backup operations to fail with the mistake “The backup has failed as a result of Microsoft VSS has timed out throughout the snapshot advent” after putting in the KB5083769 replace.
“This replace might introduce system-wide problems that impact Microsoft VSS (Quantity Shadow Reproduction Provider) operations, resulting in backup disasters,” Acronis says. “In some circumstances, the affected device might also lose connectivity with the cloud console and seem offline.”
As a short lived workaround, affected customers are urged to uninstall the problematic “Safety replace for Microsoft Home windows (KB5083769)” from Settings > Home windows Replace > Replace historical past > Similar settings > Uninstall updates, then pause Home windows updates and reboot the components.
BleepingComputer reached out to Microsoft for more info, however a reaction was once no longer instantly to be had.
Previous this month, Microsoft additionally launched out-of-band (OOB) updates to mend problems affecting Home windows Server methods that led to them to go into restart loops and cause replace set up disasters after putting in the April 2026 safety updates.
Microsoft additionally warned that some Home windows Server 2025 gadgets will boot into BitLocker restoration and ask for a BitLocker key after putting in the KB5082063 replace.
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