How severe is CVE-2026-44403?

CVE-2026-44403 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-44403 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-44403?

CVE-2026-44403 affects Wftpserver Wing Ftp Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-44403?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-44403 have an EU (EUVD) identifier?

Yes. CVE-2026-44403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29848.

When was CVE-2026-44403 published?

CVE-2026-44403 was published on 2026-05-12 and last updated on 2026-06-17.

CVE-2026-44403

CVE-2026-44403 is a high-severity vulnerability in Wftpserver Wing Ftp Server with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v4: 8.6
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29848
Weakness: CWE-94
Affected product: Wftpserver Wing Ftp Server
Published: 2026-05-12
Last modified: 2026-06-17

Description

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().

Frequently asked questions

What is CVE-2026-44403?: 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().
How severe is CVE-2026-44403?: CVE-2026-44403 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-44403 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-44403?: CVE-2026-44403 affects Wftpserver Wing Ftp Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-44403?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-44403 have an EU (EUVD) identifier?: Yes. CVE-2026-44403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29848.
When was CVE-2026-44403 published?: CVE-2026-44403 was published on 2026-05-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:wftpserver:wing_ftp_server:*:*:*:*:*:*:*:*

More vulnerabilities in Wftpserver Wing Ftp Server

CVE-2025-47812 — Critical (CVSS 10.0): In Wing FTP Server before 7.4.4. the user and admin web interfaces mishandle '\0' bytes, ultimately allowing injection…
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CVE-2019-25267 — High (CVSS 7.8): Wing FTP Server 6.0.7 contains an unquoted service path vulnerability that allows local attackers to potentially…
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