RCE in Wftpserver Wing FTP Server
CVE-2026-44403
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().
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.023 (82.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.026 · newest: 0.023 · change: -0.004
Affected products
- Wftpserver Wing FTP Server
- Wing FTP Server — versions 8.1.2, 8.1.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.vulncheck.com/advisories/wing-ftp-server-authenticated-remote-code-executio… (vendor-advisory, Third Party Advisory)
- www.wftpserver.com/serverhistory.htm (release-notes, Product, Release Notes)
Frequently asked questions
- What is CVE-2026-44403?
- CVE-2026-44403 is a high-severity vulnerability in Wftpserver Wing FTP Server, classified under Code Injection. CVSS score: 7.2/10. Published 2026-05-12.
- How severe is CVE-2026-44403?
- High severity. CVSS v3 base score is 7.2 out of 10.
- Is CVE-2026-44403 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.