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GHSA-3wgp-x9p5-c7cc

MediumCVSS 6.5 / 10

Published Sep 1, 2026·Last modified Sep 1, 2026

Affected Components(1)

@appium/base-driver

< 10.7.0

Description

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/test/guinea-pig.html:11-12 (throwError inside <script>), :50 (comment), :87 (userAgent); same in guinea-pig-scrollable.html / guinea-pig-app-banner.html.

PoC

Requests:

GET /test/guinea-pig?throwError=x%27%2balert(document.domain)%2b%27
POST /test/guinea-pig         (body: comments=</span><img src=x onerror=alert(1)>)
GET  /test/guinea-pig         (header: User-Agent: <script>alert(7)</script>)

Impact

An attacker who can get a victim to open a crafted link (or auto-submit a form) to the Appium server executes arbitrary JavaScript on the server's origin. With default CORS * + no authentication, that JS can drive the WebDriver REST API and plugin endpoints. The endpoints are debug/test fixtures that should not be reachable on a production listener at all.

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Risk Scores

Base Score

6.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the integrity of the data.

Threat Intelligence

6.0

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS

0.25%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit

Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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