Path traversal in Wing FTP Server leads to remote code execution
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
Wing FTP Server before 8.2.6 does not verify each user's base folder. An attacker with admin privileges can add user directories through scripts, and those directories can escape the base folder (CWE-22), which lets the attacker write files and can lead to remote code execution with the privileges of the server process. Because the installation guide tells users to run the command with sudo, the files can be created as root.
Written with Claude Haiku 5.5 from the sources below · 2026-11-05
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Wing Soft Technology | Wing FTP Server | before 8.2.6 | 8.2.6 | Patch available | CNA |
- Wing FTP Server VendorWing Soft Technology Affected before 8.2.6 Fixed in 8.2.6 Patch available CNA
Remediation
Upgrade Wing FTP Server to version 8.2.6, which fixes the issue.
Written with Claude Haiku 5.5 from the sources below · 2026-11-05
- Fix · CNA Wing FTP Server (Wing Soft Technology) Fixed in 8.2.6
Timeline
- 2026-10-28 Threatist record created from CVE-2026-105420
- 2026-10-28 Alias added: GHSA-fj2q-v6ch-v3mg
- 2026-11-05 CISA SSVC decision points changed
References
Sources
- CVE-2026-105420 · CVE Program
- CVE-2026-105420 · NVD
- FIRST EPSS
- GHSA-fj2q-v6ch-v3mg · GitHub Advisory Database · CC BY 4.0
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