Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-58500

CVE-2026-58500HIGH

appium appium-mcp — MCP Appium: Unescaped Locator Data XSS in MCP-UI Resource (createLocatorGeneratorUI)

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  C  L  H  N    8.2   .0040   31.9     —

AFFECTED
  Product     Versions     Fixed
  appium-mcp  < 1.85.10 –  —

TIMELINE
  Jun 30  Reserved by GitHub_M
  Jul 13  Published (CNA: GitHub_M)
  Aug 26  EXPLOIT PUBLISHED — CVE-2026-58500 (appium-mcp). Public exploit reference added.

CWE-79 · CNA: GitHub_M · CVSS v3.1 · 2 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 30, 2026	Reserved	Reserved by GitHub_M
July 13, 2026	Published	Published (CNA: GitHub_M)
August 26, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-58500 (appium-mcp). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
appium	appium-mcp	—	< 1.85.10	—

Weaknesses

CWE-79

References (2)

https://github.com/appium/appium-mcp/commit/e222bbbd6fe2b656a320efcd143563f08061a83d [Patch]
https://github.com/appium/appium-mcp/security/advisories/GHSA-x975-rgx4-5fh4 [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-58500 at cve.org

Vendors: appium

Weaknesses: CWE-79

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-58500 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.