Wing FTP Server before 8.1.3 contains an authenticated remote code execution vulnerability in the session serialization mechanism that allows authenticated administrators to inject arbitrary Lua code through the domain admin mydirectory field. Attackers can exploit unsafe serialization of session values into Lua source code without proper escaping of closing delimiters, causing the injected code to be executed when the poisoned session is loaded via loadfile(), giving the attacker full code execution on the server.

Wing FTP Server versions before 8.1.3 are affected. No later versions are listed as impacted.

The vulnerability carries a CVSS score of 8.6, indicating high severity, and the EPSS score is less than 1%, indicating a low but non‑zero exploitation probability. It is not listed in the CISA KEV catalog, suggesting no widespread exploitation has been reported yet. The attack requires a valid administrator login, so attackers must first authenticate before leveraging the vulnerability, likely via the web interface or FTP control connections.