CVE-2026-58500

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.

CVSS v3 8.2 HIGH

8.2^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 4.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact HIGH

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/appium/appium-mcp/commit/e222bbbd6fe2b656a320efcd143563f08061a83d
https://github.com/appium/appium-mcp/security/advisories/GHSA-x975-rgx4-5fh4
https://github.com/appium/appium-mcp/security/advisories/GHSA-x975-rgx4-5fh4

Configurations

No configuration.

History

14 Jul 2026, 15:17

Type	Values Removed	Values Added
References	~~() https://github.com/appium/appium-mcp/security/advisories/GHSA-x975-rgx4-5fh4 -~~	() https://github.com/appium/appium-mcp/security/advisories/GHSA-x975-rgx4-5fh4 -

13 Jul 2026, 22:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-13 22:16

Updated : 2026-07-15 20:18

NVD link : CVE-2026-58500

Mitre link : CVE-2026-58500

CVE.ORG link : CVE-2026-58500

JSON object : View

Products Affected

No product.

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

{"id": "CVE-2026-58500", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-58500", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-14T14:24:41.518699Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.2, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 4.7, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "appium", "product": "appium-mcp", "versions": [{"status": "affected", "version": "< 1.85.10"}]}]}], "published": "2026-07-13T22:16:48.677", "references": [{"url": "https://github.com/appium/appium-mcp/commit/e222bbbd6fe2b656a320efcd143563f08061a83d", "source": "security-advisories@github.com"}, {"url": "https://github.com/appium/appium-mcp/security/advisories/GHSA-x975-rgx4-5fh4", "source": "security-advisories@github.com"}, {"url": "https://github.com/appium/appium-mcp/security/advisories/GHSA-x975-rgx4-5fh4", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-79"}]}], "descriptions": [{"lang": "en", "value": "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 \u2014 text, content-desc, resource-id, and locator selector values \u2014 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."}], "lastModified": "2026-07-15T20:18:23.677", "sourceIdentifier": "security-advisories@github.com"}