CVE-2026-105420
CriticalCVSS 9.4Summary
Wing FTP Server does not verify the user's base folder, allowing an attacker with admin privileges to add user directories via scripts that escape the base folder. This enables file writes on the system and potential remote code execution with process owner privileges, and with sudo-based installation files are created as root. Fixed in version 8.2.6.
Risk Assessment
An attacker with admin privileges can write files outside the allowed directory, potentially leading to remote code execution, including as root. Critical risk for FTP servers installed via sudo.
Recommendation
Update Wing FTP Server to version 8.2.6 or later and avoid running the service with root privileges.
Other vulnerabilities in Wing FTP Server
See all- CVE-2026-44403High
Wing FTP Server before version 8.1.3 contains an authenticated remote code execution vulnerability in the session serialization mechanism. This allows authenticated administrators to inject arbitrary Lua code through the mydirectory field in the admin panel.
- CVE-2025-47813MediumActively exploited
loginok.html in Wing FTP Server before 7.4.4 discloses the full local installation path of the application when using a long value in the UID cookie.
- CVE-2025-47812CriticalActively exploited
In Wing FTP Server before 7.4.4, the user and admin web interfaces mishandle '\0' bytes, ultimately allowing injection of arbitrary Lua code into user session files. This can be used to execute arbitrary system commands with the privileges of the FTP service (root or SYSTEM by default). This is thus a remote code execution vulnerability that guarantees a total server compromise. This is also exploitable via anonymous FTP accounts.
Original NVD description (English source)
Wing FTP Server does not verify user's base folder. An attacker with admin privileges can add user directories via scripts, allowing the added directories to escape the base folder. This allows the attacker to write files on the system and can lead to remote code execution with process owner privileges.Critically, since the installation guide mentions running the command with `sudo`, the files are created as “root.” This issue was fixed in version 8.2.6.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS