---
id: "CVE-2026-120491"
kind: "vulnerability"
aliases: ["CVE-2026-120491"]
title: "Wing FTP Server: stored script injection lets users run code in admin browsers"
severity: "medium"
cvss: 5.4
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["ftp", "runtime", "self-hosted", "wing-ftp-server"]
not_affected_if: ["version-8.2.6-or-later", "web-client-disabled"]
published_at: "2026-11-02T15:17:31+00:00"
first_seen_at: "2026-11-02T15:24:04+00:00"
updated_at: "2026-11-02T15:26:21+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-120491", "first_seen_at": "2026-11-02T15:24:04+00:00"}]
---

# Wing FTP Server: stored script injection lets users run code in admin browsers

Wing FTP Server before 8.2.6 lets an authenticated web-client user store a crafted nowpath parameter that breaks out of an XML CDATA section and forges a connection id. The script runs in an administrator's browser when the connection list auto-refreshes, which the description says enables Lua console abuse.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Wing FTP Server version; the sources say versions before `8.2.6` are affected.
- Confirm whether the web client is exposed to users who can log in.

## Fix

- Move to `8.2.6` or later, per the sources.

## Timeline

- 2026-11-02T15:24:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-120491

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/wing-ftp-server-before-8.2.6-stored-xss-via-nowpath-in-legacy-activity-page

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_