CVE-2021-47890 LogonExpert 8.1 - 'LogonExpertSvc' Unquoted Service Path
Attackers can exploit an unquoted service path in LogonExpert to execute malicious code with LocalSystem privileges during service startup.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-47890?
CVE-2021-47890 is a high-severity vulnerability in Softros Systems LogonExpert, published on 23 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Weakness: CWE-428
Which versions are affected by CVE-2021-47890?
How do I fix CVE-2021-47890?
No fix has been published for CVE-2021-47890 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-47890 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47890 exists.
Sources
Also known as GHSA-6xfm-hcmf-ch35.