Microsoft confirms April Windows updates cause backup failures
ATT&CK techniques detected
T1068Exploitation for Privilege Escalation
65%
“uses newer drivers, which include the required protections. on impacted systems, where the vulnerable drive is blocked by windows code integrity enforcement, it admins and users may observe the following behavior : - backup applications that rely on the kernel driver psmounterex.…”
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Summary
Microsoft has confirmed that the April 2026 security updates are causing failures in third-party backup applications using the psmounterex.sys driver. [...]