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Wing Ftp ServerApplication · Wftpserver

CVE-2026-44403

HIGH · 7.2 CVSS v3.1 Published 2026-05-12
Fix available
A fix is available. Upgrade to 8.1.3 or later.
See remediation →
78/100
Remediation priority · High
Remotely reachable Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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().

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Wing FTP Server before 8.1.3 allows authenticated administrators to inject arbitrary Lua code through the domain admin 'mydirectory' field. The vulnerability stems from unsafe serialization of session values directly into Lua source code without escaping closing delimiters, causing injected code to execute when the poisoned session is loaded via loadfile().

MitigationUpgrade to Wing FTP Server 8.1.3 or later. Until then, limit administrative access to trusted personnel only and monitor for suspicious admin session activity.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Wing Ftp ServerApplication
Affected:< 8.1.3

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify Wing FTP Server installation and version
    Check the installed Wing FTP Server version - this is typically visible in the server admin console, in the Windows Services list, or in the program's About/Help section. Compare the version number to the affected range (versions before 8.1.3).
    Affected if The installed version is Wing FTP Server and the version is lower than 8.1.3
  2. Verify administrative access is enabled
    Confirm whether remote or local administrator accounts exist and are enabled for Wing FTP Server. Check if the web admin interface or console is accessible.
    Affected if Administrative accounts exist and the admin interface is accessible (even to trusted users, the vulnerability applies if admin access exists)
  3. Check domain admin configuration access
    Examine whether domain-level administrative accounts can be configured or if any domain admin functionality exists in the installation.
    Affected if Domain admin accounts or the domain admin 'mydirectory' feature is available in the installation
  4. Inspect session storage for Lua code injection artifacts
    If accessible, examine Wing FTP Server session files or configuration files for unexpected Lua code patterns, particularly any loadfile() calls or suspicious string literals that may indicate prior exploitation.
    Affected if Session files or configuration contain unescaped Lua delimiters or unexpected Lua source code that could indicate injection

You are affected if Wing FTP Server version is below 8.1.3 and administrative or domain admin access exists in your environment.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 8.1.3 or later
Fixed in 8.1.3
Interim mitigation

Upgrade to Wing FTP Server 8.1.3 or later. Until then, limit administrative access to trusted personnel only and monitor for suspicious admin session activity.

Recommended fix High confidence

8.1.3

  1. 1. Back up the current Wing FTP Server configuration and data directories
  2. 2. Download Wing FTP Server version 8.1.3 from the official vendor website (www.wftpserver.com)
  3. 3. Stop the Wing FTP Server service before upgrading
  4. 4. Install version 8.1.3 following the vendor's standard upgrade procedure
  5. 5. Verify the upgrade was successful by checking the server version in the admin console
  6. 6. Restart the Wing FTP Server service
  7. 7. Test that administrator authentication works correctly and that the vulnerability is remediated
Caveat Standard upgrade - review release notes for any configuration changes between your current version and 8.1.3

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Wing Ftp Server Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,130
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,408.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-44403 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data