# CVE-2026-120491: Wing FTP Server stored cross-site scripting in web client

Source: https://junglewise.ai/threats/cve-2026-120491-wing-ftp-server-before-8-2-6-contains-a-stored-cross-site  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-02. Updated: 2026-11-02  
License: CC BY 4.0 with a link back

CVE-2026-120491 · Severity: medium · CVSS 5.4 · Published 2026-11-02

Wing FTP Server is file transfer software used by organizations to manage FTP services and web-based file access. This vulnerability allows authenticated users to inject malicious scripts that execute in administrators' browsers when they view connection logs, potentially enabling attackers to abuse the Lua console for further compromise.

Technologies: [Wing FTP Server](https://junglewise.ai/threats/technologies/wing-ftp-server). Vendors: [Wing FTP Server](https://junglewise.ai/threats/vendors/wing-ftp-server).

## Quick answers

**Is CVE-2026-120491 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-120491 being exploited in the wild.

**How severe is CVE-2026-120491?** Medium severity, with a CVSS score of 5.4, published 2 November 2026.

**Which products and versions are affected?** Wing FTP Server before 8.2.6.

**Is there a fix for CVE-2026-120491?** Yes: fixed in 8.2.6. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-120491 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-120491?** Check whether you run Wing FTP Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 8.2.6

## Technical details

A stored XSS vulnerability exists in the webclient/makethumb.html endpoint where the nowpath parameter is not properly sanitized. Authenticated web-client users can inject script by crafting a malicious nowpath parameter that breaks out of the CDATA section in admin_get_lastconn.html XML, forging a connection ID that executes when admin_connection_list.html auto-refreshes in administrators' browsers.

## Affected products

- Wing FTP Server Wing FTP Server before 8.2.6

## Timeline

- 2026-11-02: disclosed

## References

- [https://www.vulncheck.com/advisories/wing-ftp-server-before-8.2.6-stored-xss-via-nowpath-in-legacy-activity-page](https://www.vulncheck.com/advisories/wing-ftp-server-before-8.2.6-stored-xss-via-nowpath-in-legacy-activity-page)
- [https://www.wftpserver.com/serverhistory.htm](https://www.wftpserver.com/serverhistory.htm)

## Related threats

- [Wing FTP Server information disclosure in loginok.html](https://junglewise.ai/threats/cve-2025-47813-wing-ftp-server-information-disclosure-in-loginok-html)
- [Wing FTP Server remote code execution via null byte injection](https://junglewise.ai/threats/cve-2025-47812-wing-ftp-server-remote-code-execution-via-null-byte-injection)