XSS in Wing FTP Software Server
CVE-2026-120491
Wing FTP Server before 8.2.6 contains a stored cross-site scripting vulnerability that allows authenticated web-client users to inject script by sending a crafted nowpath parameter to webclient/makethumb.html. Attackers can break out of the directory CDATA section in admin_get_lastconn.html XML to forge a connection id, which executes in administrators' browsers when admin_connection_list.html auto-refreshes, enabling Lua console abuse.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- www.wftpserver.com/serverhistory.htm (release-notes, vendor-advisory)
- www.vulncheck.com/advisories/wing-ftp-server-before-8.2.6-stored-xss-via-nowpat… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-120491?
- CVE-2026-120491 is a medium-severity vulnerability in Wing FTP Software Server, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-11-02.
- How severe is CVE-2026-120491?
- Medium severity. CVSS v3 base score is 5.4 out of 10.