CVE-2026-58500
HighCVSS 8.2Exploitation Probability (EPSS)
Low risk27th percentile - higher than 27% of all known CVEs
Summary
In MCP Appium prior to version 1.85.10, the createLocatorGeneratorUI function interpolates attacker-controlled element attributes directly into an HTML template literal without escaping. This allows injection of arbitrary HTML and JavaScript, which executes in the victim's MCP client context.
Risk Assessment
An attacker can hijack the victim's MCP tools, performing unauthorized actions such as taking screenshots, reading page source, or other registered capabilities, leading to confidentiality and integrity breaches.
Recommendation
Upgrade MCP Appium to version 1.85.10 or later immediately, which fixes the code injection vulnerability.
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Original NVD description (English source)
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.

