CVE-2026-44403Public exploitNetwork attack vector

Authenticated code execution via unsafe session serialization

Published May 12, 2026 · Updated May 12, 2026

Code injection in Wing FTP Server before 8.1.3 allows remote authenticated users to execute arbitrary Lua code through web administration. Session values containing the domain administrator mydirectory field are emitted into Lua source without escaping closing delimiters, then executed by loadfile(). System-administrator credentials are required; successful injection runs attacker-supplied Lua code with the server process's privileges.

CVSS severity8.6
High
EPSS probability2.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Wing FTP Server before 8.1.3 allows remote authenticated users to execute arbitrary Lua code through web administration. Session values containing the domain administrator mydirectory field are emitted into Lua source without escaping closing delimiters, then executed by loadfile(). System-administrator credentials are required; successful injection runs attacker-supplied Lua code with the server process's privileges.

The record

CVE
CVE-2026-44403
Published
May 12, 2026
Updated
May 12, 2026
Vendor
Wing Soft Technology
Product
Wing FTP Server
Classifications
CWE-94, T1059
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Wing Soft Technology · Wing FTP Serverversion=8.1.2

Published CVSS scores

7.2VulnCheckCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
8.6VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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