Security readout for executives and security teams
Plain-English summary
This flaw lets an authenticated Wing FTP administrator turn a saved session value into code execution on the server. It is not a drive-by internet bug: the attacker needs admin access first. If admin credentials are compromised, the FTP server can become a full execution foothold.
Executive priority
Prioritize remediation for internet-facing or business-critical Wing FTP servers. The required admin privilege lowers mass-exploitation likelihood, but successful abuse can provide direct server code execution after credential compromise.
Technical view
Wing FTP Server before 8.1.3 is reported to serialize session values into Lua source without safely escaping closing delimiters. A domain admin mydirectory value can poison the session, and later loading through loadfile() executes injected Lua code. The CVE maps to CWE-94 and has CVSS 4.0 score 8.6.
Likely exposure
Organizations running Wing FTP Server, especially versions identified as before 8.1.3, should review exposure. The source bundle’s affected-version data is inconsistent with the title, so confirm exact installed and fixed versions against Wing FTP release notes.
Exploitation context
The source bundle reports authenticated administrator privileges are required, with network access, low complexity, and no user interaction. It does not show CISA KEV listing or cite confirmed active exploitation. Treat this as serious post-authentication RCE, especially where admin accounts are shared or externally reachable.
Researcher notes
Evidence supports a session-serialization code injection path involving Lua source generation and loadfile(). The available bundle does not include exploit telemetry, KEV status, or complete fixed-version clarity beyond the <8.1.3 title and vendor release-note reference.
Mitigation direction
- Check Wing FTP Server release notes for the fixed version and upgrade promptly.
- Restrict administrative access to trusted networks and identities only.
- Review domain administrator accounts and remove unnecessary privileges.
- Rotate admin credentials if compromise is suspected.
- Monitor vendor and CVE records for updated remediation guidance.
Validation and detection
- Inventory Wing FTP Server instances and record exact versions.
- Confirm whether any instance is before the vendor-fixed release.
- Review admin access logs for unusual domain setting changes.
- Audit domain admin mydirectory values for unexpected content.
- Verify administrative interfaces are not broadly internet-exposed.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-94: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-44403 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.6 (4.0)
- Known Exploited
- No
- Published
Vector: 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
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
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——VulnCheckCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H1.25.9VulnCheckVulnerability scoring details
Base CVSS 4.0 score
8.6HighVector: 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
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.vulncheck.com/advisories/wing-ftp-server-authenticated-remote-code-execution-via-session-serializationCVE reference, VulnCheck · vendor-advisory
- https://www.wftpserver.com/serverhistory.htmCVE reference, VulnCheck · release-notes
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Control of Generation of Code ('Code Injection')
Improper Control of Generation of Code ('Code Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.