MCP Appium is an MCP server that provides AI assistants with tools to automate mobile app testing on Android and iOS. In versions prior to 1.85.10, the createLocatorGeneratorUI function interpolates attacker-controlled element attributes — text, content-desc, resource-id, and locator selector values — directly into an HTML template literal without any HTML or JavaScript context escaping. An attacker who controls the UI of the app under test can inject arbitrary HTML and JavaScript into the MCP UI resource returned by the generate_locators tool. When a victim's MCP client renders this resource, the injected script executes and can invoke arbitrary MCP tools via window.parent.postMessage, leading to unauthorized MCP tool execution such as taking screenshots, reading page source, or any other registered capability. This issue has been fixed in version 1.85.10.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/appium/appium-mcp/commit/e222bbbd6fe2b656a320efcd143563f08061a83d Patch
- https://github.com/appium/appium-mcp/security/advisories/GHSA-x975-rgx4-5fh4 Exploit, Vendor Advisory
- https://github.com/appium/appium-mcp/security/advisories/GHSA-x975-rgx4-5fh4 Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.2 · appiumNVD modified 2026-10-24 22:10
Affected (CPE criteria) 1
cpe:2.3:a:appium:appium-mcp:*:*:*:*:*:node.js:*:*