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Microsoft security patch release for CVE-2023-43896

Security Patch Release
First reported
Last updated
Happening score
H score 10
1 unique sources, 1 articles

Summary

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Microsoft's April 2026 Windows security updates are blocking psmounterex.sys, which can break third-party backup apps on Windows 10, Windows 11, and Windows Server. The change adds the driver to the Vulnerable Driver Blocklist to protect systems against CVE-2023-43896, a high-severity buffer overflow that can enable privilege escalation or arbitrary code execution. Impacted products include Macrium Reflect, Acronis Cyber Protect Cloud, UrBackup Server, and NinjaOne Backup. Microsoft said affected customers should move to newer app versions that use updated drivers rather than pausing the update.

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Timeline

  1. 04.05.2026 13:40 2 articles · 23d ago

    Microsoft confirms April 2026 Windows security updates block psmounterex.sys

    Initial Disclosure

    Microsoft confirmed that the April 2026 Windows security updates added psmounterex.sys to the Vulnerable Driver Blocklist to protect systems against CVE-2023-43896, and that the change can prevent third-party backup applications from mounting or managing disk images, especially when they rely on VSS snapshots on Windows 10, Windows 11, and Windows Server. Affected customers are advised to move to newer app versions that use newer drivers rather than pausing or uninstalling the update.

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