Vulnerabilities

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().

Wing FTP Server versions prior to 6.2.7 contain a cross-site request forgery (CSRF) vulnerability in the web administration interface that allows attackers to delete admin users. Attackers can craft a malicious HTML page with a hidden form to submit a request that deletes the administrative user account without proper authorization.

Wing FTP Server 6.0.7 contains an unquoted service path vulnerability that allows local attackers to potentially execute arbitrary code with elevated system privileges. Attackers can exploit the unquoted binary path in the service configuration to inject malicious executables that will be launched with LocalSystem permissions.

Wing FTP Server 6.3.8 contains a remote code execution vulnerability in its Lua-based web console that allows authenticated users to execute system commands. Attackers can leverage the console to send POST requests with malicious commands that trigger operating system execution through the os.execute() function.

Wing FTP Server versions before 7.4.4 mishandle NUL ('\0') bytes in the user and admin web interfaces, allowing attackers to inject arbitrary Lua code into user session files (CWE-158). When the crafted session file is loaded, the injected Lua runs, giving an unauthenticated attacker execution of arbitrary system commands with the privileges of the FTP service — root on Linux or SYSTEM on Windows by default — which means a total server compromise. The flaw is exploitable without credentials, including through anonymous FTP accounts, so any organization running Wing FTP Server is affected, particularly those exposing its FTP or web interfaces to the internet. Exploitation is confirmed in the wild shortly after technical details and public proof-of-concept write-ups were published; CISA added the flaw to its Known Exploited Vulnerabilities catalog on 2025-07-14, and EPSS assigns a ~93% probability of exploitation within 30 days.

Do: Upgrade to Wing FTP Server 7.4.4 or later immediately, as it is the only fixed version named in the advisory; as interim mitigation, disable anonymous FTP access and restrict the user/admin web interfaces from the internet. Hunt for signs of compromise — unexpected Lua content in user session files, commands run by the FTP service account, or newly spawned processes or webshells — because the service runs as root/SYSTEM by default and any successful exploitation implies full server control. Federal agencies must apply vendor mitigations per BOD 22-01 guidance or discontinue use of the product per the KEV listing.

Wing FTP Server before 7.4.4 does not properly validate and sanitize the url parameter of the downloadpass.html endpoint, allowing injection of an arbitrary link. If a user clicks a crafted link, this discloses a cleartext password to the attacker.

A vulnerability has been found in Wing FTP Server up to 7.4.3 and classified as critical. Affected by this vulnerability is an unknown functionality of the component Lua Admin Console. The manipulation leads to execution with unnecessary privileges. The attack can be launched remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. Upgrading to version 7.4.4 is able to address this issue. It is recommended to upgrade the affected component. The vendor explains: "[W]e do not consider it as a security vulnerability, because the system admin in WingFTP has full permissions [...], but you can suggest the user run WingFTP service as Normal User rather than SYSTEM/Root, it will be safer."

Weak access control in Wing FTP Server (Admin Web Client) allows for privilege escalation.This issue affects Wing FTP Server: <= 7.2.0.

An XSS issue was discovered in Wing FTP 6.4.4. An arbitrary IFRAME element can be included in the help pages via a crafted link, leading to the execution of (sandboxed) arbitrary HTML and JavaScript in the user's browser.

Wing FTP Server v6.2.3 for Linux, macOS, and Solaris sets insecure permissions on installation directories and configuration files. This allows local users to arbitrarily create FTP users with full privileges, and escalate privileges within the operating system by modifying system files.