CVE-2021-47890: Softros Systems Logonexpert

High severity, CVSS 7.8. EPSS: 0.1% chance of exploitation in the next 30 days.

LogonExpert 8.1 contains an unquoted service path vulnerability in the LogonExpertSvc service running with LocalSystem privileges. Attackers can exploit the unquoted path to place malicious executables in intermediate directories, potentially gaining elevated system access during service startup.

Affected products

• Softros Systems Logonexpert: version 8.1 only

Published 2026-01-23. Last modified 2026-06-17.