EUVD-2026-335366

fkie_cve-2026-58191

Appium is a cross-platform automation framework for all kinds of apps, built on top of the W3C WebDriver protocol. Prior to 10.7.0, Appium's base-driver unconditionally mounts the /test/guinea-pig, /test/guinea-pig-scrollable, and /test/guinea-pig-app-banner routes, and compileLodashTemplate reflects the throwError query parameter, comments POST field, and User-Agent request header into HTML without escaping, allowing reflected cross-site scripting and arbitrary JavaScript execution on the server origin. This issue is fixed in version 10.7.0.

GHSA-3wgp-x9p5-c7cc — Appium: Reflected XSS / arbitrary JS in @appium/base-driver /test/guinea-pig* routes

Affected: npm: @appium/base-driver

## Summary

Appium's base-driver mounts the built-in `/test/guinea-pig`, `/test/guinea-pig-scrollable` and `/test/guinea-pig-app-banner` routes **unconditionally** on every server. The handler reflects the `throwError` query param, the `comments` POST field, and the `User-Agent` request header into the returned HTML via `compileLodashTemplate`, which interpolates `<%= expr %>` as `String(expr)` with **no HTML/JS escaping**. This yields reflected XSS, and the `throwError` value is reflected **inside a `<script>` block**, giving arbitrary JavaScript execution on the server's origin. No authentication, no session, no driver and no plugin are required, and the default bind address is `0.0.0.0`.

## Details

### Affected - `@appium/base-driver` **10.6.0** (with Appium server **3.5.0**); tested live. - Template engine helper: `@appium/base-driver` `lib/utils.ts` `compileLodashTemplate`.

### Location (file:line) - Routes mounted unconditionally: `base-driver/lib/express/server.ts:216-219` (`app.all('/test/guinea-pig', guineaPig)` etc.). - Tainting: `base-driver/lib/express/static.ts:35-61` (`guineaPigTemplate`) — `throwError = String(req.params.throwError ?? req.query?.throwError)`, `params.comment = String(req.body.comments)`, `params.userAgent = req.headers['user-agent']`. - Unescaped render: `base-driver/lib/utils.ts:67-83` (`compileLodashTemplate`) emits `<%= expr %>` as `String(${expr})` via `new Function(...)`, no escaping. - Sinks (shipped templates): `base-driver/static/te…

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EUVD-2026-335366

fkie_cve-2026-58191

GHSA-3wgp-x9p5-c7cc — Appium: Reflected XSS / arbitrary JS in @appium/base-driver /test/guinea-pig* routes