Microsoft Windows 11 April 2026 Security Update Breaks Third-Party Backup Applications
ID: 9337fc41-a598-561f-8104-8c154e3f96b0
STIX ID: report--9337fc41-a598-561f-8104-8c154e3f96b0
Feed Name: cybersecurityNews.com
Threat Score
Microsoft’s April 2026 cumulative update KB5083769 (Windows 11 24H2/25H2) contains a VSS regression that causes snapshot-based backups to stall or timeout, impacting third‑party backup vendors such as UrBackup, Macrium Reflect, and Acronis; vendors recommend uninstalling the update and administrators are advised to pause deployment (MS-DEFCON 3) until a fix is released.
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