CVE-2026-44403: Wing FTP Server before 8.1.3 contains an authenticated remote code execution vulnerability in the session seri

Q: How do I fix CVE-2026-44403?

wing ftp server: upgrade to 8.1.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-44403 being exploited?

CVE-2026-44403 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-44403 affect?

CVE-2026-44403 affects wing ftp server. Severity is high (CVSS 7.2). 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 fie

Q: How urgent is CVE-2026-44403?

Priority 52/100. High severity; Public exploit reference

This month

HIGH 7.2UPGRADE

CVE-2026-44403 is a high-severity flaw (CVSS 7.2) affecting wing ftp server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	2.6% (top 14%)
CISA exploited list	No
Weakness	CWE-94
Published	2026-05-12
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: wftpserver

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-12 21:16 UTCPublished CVE record published
2026-06-17 10:50 UTCUpdated Record last modified

wftpserver wing ftp server UPGRADE

Affected: < 8.1.3

Fixed in: 8.1.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy wing-ftp-server || rpm -q wing-ftp-server || wing-ftp-server --version

2. UPGRADE to 8.1.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade wing-ftp-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wing-ftp-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Wing FTP Server 8.1.3 - Authenticated Remote Code Execution

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-44403?

wing ftp server: upgrade to 8.1.3. Exact commands for each OS are on this page.

Is CVE-2026-44403 being exploited?

CVE-2026-44403 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-44403 affect?

CVE-2026-44403 affects wing ftp server. Severity is high (CVSS 7.2). 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 fie

How urgent is CVE-2026-44403?

Priority 52/100. High severity; Public exploit reference

References

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