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CVE-2026-58500— MCP Appium: Unescaped Locator Data XSS in MCP-UI Resource (createLocatorGeneratorUI)

Quick assessment

Affected
appium appium-mcp
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Appium MCP Appium是Appium组织的一款移动应用自动化测试工具。 Appium MCP Appium 1.85.10之前版本存在跨站脚本漏洞，该漏洞源于createLocatorGeneratorUI函数将攻击者控制的元素属性直接插入HTML模板文字，未进行HTML或JavaScript环境转义，可能导致跨站脚本攻击，进而未经授权执行MCP工具。

CVSS 8.2 · High EPSS 0.40% · P32

Affected Version Matrix 1

VendorProduct Version RangeStatus
appium appium-mcp < 1.85.10 affected
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I. Basic Information for CVE-2026-58500

Vulnerability Information
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Vulnerability Title
MCP Appium: Unescaped Locator Data XSS in MCP-UI Resource (createLocatorGeneratorUI)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Appium MCP Appium 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Appium MCP Appium是Appium组织的一款移动应用自动化测试工具。 Appium MCP Appium 1.85.10之前版本存在跨站脚本漏洞，该漏洞源于createLocatorGeneratorUI函数将攻击者控制的元素属性直接插入HTML模板文字，未进行HTML或JavaScript环境转义，可能导致跨站脚本攻击，进而未经授权执行MCP工具。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
appium appium-mcp < 1.85.10 -

II. Public POCs for CVE-2026-58500

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 9470 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-58500

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Patches & Fixes for CVE-2026-58500 (1)

Vendor Advisories for CVE-2026-58500 (1)

IV. Related Vulnerabilities

Same vendor: appium
Same weakness: CWE-79

V. Comments for CVE-2026-58500

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