OS SecurityBleeping Computer
7.8 — HIGH
Microsoft confirms April Windows updates cause backup failures
Microsoft has confirmed that the April 2026 security updates are causing failures in third-party backup applications using the psmounterex.sys driver. [...]
🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview
Microsoft's April 2026 security updates have caused backup failures in third-party applications using the psmounterex.sys driver, affecting Windows 11, Windows Server, and Windows 10 devices.
⚙️Technical Details
💥Impact Assessment
Severity: high
🛡️Recommended Actions
1Update to a newer version of the affected application that uses newer drivers
2Check for 'Event ID 3077' with Policy ID {D2BDA982-CCF6-4344-AC5B-0B44427B6816}' in the Code Integrity Operational log
3Install the latest application versions and validate against the driver blocklist
📦Affected Products
Macrium ReflectMacrium Reflect (CVE-2023-43896)Acronis Cyber Protect CloudUrBackup ServerNinjaOne Backup
🔐NVD Verified DataVERIFIED
CVE-2023-43896 ↗CVSS 7.8 — HIGH
Attack Vector
LOCAL
Complexity
LOW
Vector String
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWeaknesses
CWE-120
Affected Products (CPE)
Macrium Reflect
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