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Vulnerability record · CVE-2020-27735 · published 26 January 2021

CVE-2020-27735: Wftpserver wing ftp server cross-site scripting vulnerability

Wftpserver · Wing Ftp Server

An XSS issue was discovered in Wing FTP 6.4.4. An arbitrary IFRAME element can be included in the help pages via a crafted link, leading to the execution of (sandboxed) arbitrary HTML and JavaScript in the user's browser.

6.1 CVSS 3.1 Medium EPSS 5.8% · top 7.2% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
5.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An XSS issue was discovered in Wing FTP 6.4.4. An arbitrary IFRAME element can be included in the help pages via a crafted link, leading to the execution of (sandboxed) arbitrary HTML and JavaScript in the user's browser.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://wshenk.blogspot.com/2021/01/xss-in-wing-ftps-web-interface-cve-2020.html ExploitThird Party Advisory
https://www.wftpserver.com/serverhistory.htm Release NotesVendor Advisory
https://wshenk.blogspot.com/2021/01/xss-in-wing-ftps-web-interface-cve-2020.html ExploitThird Party Advisory
https://www.wftpserver.com/serverhistory.htm Release NotesVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2025-47812Wing FTP Server null byte handling leads to Lua code injection RCEWing FTP Server before 7.4.4 mishandles '\0' bytes in its user and admin web interfaces, allowing injection of arbitrary Lua code into user session f…KEVEPSS 93%analysed4.3CVE-2025-47813Wing FTP Server path disclosure via long UID cookieWing FTP Server before 7.4.4 leaks the full local installation path through loginok.html when a long value is supplied in the UID cookie. The flaw is…KEVEPSS 63%analysed8.8CVE-2025-27889Wftpserver wing ftp server vulnerabilityWing FTP Server before 7.4.4 does not properly validate and sanitize the url parameter of the downloadpass.html endpoint, allowing injection of an ar…EPSS 0.44%8.8CVE-2023-37878Wftpserver wing ftp server incorrect default permissions vulnerabilityInsecure default permissions in Wing FTP Server (Admin Web Client) allows for privilege escalation.This issue affects Wing FTP Server: <= 7.2.0.EPSS 0.51%8.8CVE-2023-37881Wftpserver wing ftp server incorrect authorization vulnerabilityWeak access control in Wing FTP Server (Admin Web Client) allows for privilege escalation.This issue affects Wing FTP Server: <= 7.2.0.EPSS 0.56%8.6CVE-2026-44403Wftpserver wing ftp server code injection vulnerabilityWing FTP Server before 8.1.3 contains an authenticated remote code execution vulnerability in the session serialization mechanism that allows authent…EPSS 2.3%8.6CVE-2020-37032Wftpserver wing ftp server os command injection vulnerabilityWing FTP Server 6.3.8 contains a remote code execution vulnerability in its Lua-based web console that allows authenticated users to execute system c…EPSS 1.1%8.5CVE-2019-25267Wftpserver wing ftp server unquoted search path vulnerabilityWing FTP Server 6.0.7 contains an unquoted service path vulnerability that allows local attackers to potentially execute arbitrary code with elevated…EPSS 0.24%

Source: NIST National Vulnerability Database (record CVE-2020-27735), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.