Wing Soft Wing FTP Server up to 8.2.5 Base Folder Verification path traversal

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Wing Soft Wing FTP Server up to 8.2.5. The impacted element is an unknown function of the component Base Folder Verification. Performing a manipulation results in path traversal. This vulnerability is known as CVE-2026-105420. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical has been found in Wing Soft Wing FTP Server up to 8.2.5. This affects an unknown functionality of the component Base Folder Verification. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at cert.pl. This vulnerability is uniquely identified as CVE-2026-105420 since 10/05/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The exploitation requires an enhanced level of successful authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/28/2026). The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 8.2.6 eliminates this vulnerability.

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Productinfo

Type

• File Transfer Software

Vendor

• Wing Soft

Name

• Wing FTP Server

Version

• 8.2.0
• 8.2.1
• 8.2.2
• 8.2.3
• 8.2.4
• 8.2.5

CPE 2.3info

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CPE 2.2info

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