appium MCP up to 1.85.9 Locator Generator UI createLocatorGeneratorUI text/content-desc/resource-id/locator selector cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, was found in appium MCP up to 1.85.9. Affected by this issue is the function createLocatorGeneratorUI of the component Locator Generator UI. Such manipulation of the argument text/content-desc/resource-id/locator selector leads to cross site scripting. This vulnerability is referenced as CVE-2026-58500. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in appium MCP up to 1.85.9. It has been rated as problematic. Affected by this issue is the function createLocatorGeneratorUI of the component Locator Generator UI. The manipulation of the argument text/content-desc/resource-id/locator selector with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-58500 since 06/30/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 1.85.10 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Artificial Intelligence Software

Vendor

• appium

Name

• MCP

Version

• 1.85.0
• 1.85.1
• 1.85.2
• 1.85.3
• 1.85.4
• 1.85.5
• 1.85.6
• 1.85.7
• 1.85.8
• 1.85.9

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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