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CVE-2026-44403

HighPublished

Wing FTP Server < 8.1.3 Authenticated Remote Code Execution via Session Serialization

Published: May 12, 2026
Updated: Jul 14, 2026
Assigning CNA: VulnCheck
Evidence observed: May 29, 2026

Primary CVSS

8.6/ 10High

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

2.6%

Low · next 30 days

Percentile: 84.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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().

Sources

CVE-2026-44403-WingFTP-v8.1.2-POC-ExploitPoC
CVE-2026-44403-WingFTP-v8.1.2-POC-Exploit
Wing FTP Server 8.1.3 - Authenticated Remote Code ExecutionExploit
Ünsal Furkan Harani · multiple · May 29, 2026

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