# CVE-2026-58191: Appium: Reflected XSS / arbitrary JS in @appium/base-driver /test/guinea-pig* routes

> Attackers can execute arbitrary JavaScript via reflected XSS in Appium's test routes, potentially compromising the server origin.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 8 Jul 2026
- **Updated:** 9 Jul 2026
- **Also known as:** GHSA-3wgp-x9p5-c7cc

## What is CVE-2026-58191?

CVE-2026-58191 is a medium-severity cross-site scripting vulnerability in appium, published on 8 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

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.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-489 (Active Debug Code)

## Which versions are affected by CVE-2026-58191?

2 open source packages ship an affected version, including @appium/base-driver. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `@appium/base-driver` | npm | All versions | 10.7.0 |
| `@appium/base-driver` | npm | All versions | 10.7.0 |

Products: Appium Appium\/Base-Driver.

## How do I fix CVE-2026-58191?

Upgrade @appium/base-driver to 10.7.0 or later.

## Is CVE-2026-58191 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58191 exists.

Public exploit code:

- Appium base-driver <=10.6.0 - Reflected Cross-Site Scripting (nuclei): http/cves/2026/CVE-2026-58191.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-58191 and fix it if it is affected.

What it is: CVE-2026-58191 is a medium-severity cross-site scripting vulnerability in appium, published on 8 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58191 exists.

Affected packages and fixed versions:
- @appium/base-driver (npm): affected all versions; fixed in 10.7.0
- @appium/base-driver (npm): affected all versions; fixed in 10.7.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-58191/ (Markdown: https://insights.sbomify.com/CVE-2026-58191/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-58191
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-58191
- OSV: https://osv.dev/vulnerability/CVE-2026-58191

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-58191/
Summaries are generated and may contain mistakes; the official description above is the record.