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Vulnerability in Wing FTP Server software
28 October 2026 | CERT Polska | #vulnerability, #warning, #cve
CVE ID CVE-2026-105420
Publication date 28 October 2026
Vendor Wing Soft Technology
Product Wing FTP Server
Vulnerable versions All before 8.2.6
Vulnerability type (CWE) Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (CWE-22)
Report source Report to CERT Polska

Description

CERT Polska has received a report about vulnerability in Wing FTP Server software and participated in coordination of its disclosure.

The vulnerability CVE-2026-105420: 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.

Credits

We thank Olek Malinowski for the responsible vulnerability report.

More about the coordinated vulnerability disclosure process at CERT Polska can be found at https://cert.pl/en/cvd/.