Vulnerability · Published Jan 23, 2026 · Assigned by VulnCheck
CVE-2021-47890LogonExpert 8.1 - 'LogonExpertSvc' Unquoted Service Path
High 7.8
In plain English
A high-severity security flaw in LogonExpert from Softros Systems. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities).
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.1%top 96.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Softros Systems | LogonExpert | 8.1 |
Weakness: CWE-428 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- ExploitDB-49586 exploit
- Vendor Homepage product
- Software Download Link product
- VulnCheck Advisory: LogonExpert 8.1 - 'LogonExpertSvc' Unquoted Service Path third-party-advisory