VULNpocalypse

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

Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.

Generated by VEDAS. Scores as of 2026-11-08 00:03 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.

What it is

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.

Description quoted from the CVE record (assigned by GitHub_M, published 2026-07-08).

Weakness: CWE-79: Improper Neutralization of Input During Web Page Generation (‘Cross-site Scripting’); CWE-489: Active Debug Code

How it can be exploited

Exploitable over the network with low attack complexity needing no privileges and a user must take an action. Impact: confidentiality none, integrity high, availability none. CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: no. Technical impact: partial.

Public exploit evidence (Exploit Observer)

Exploit Observer found 1 Nuclei template and 5 code repositories naming this CVE.

Code repositories that name a CVE are often scanners, copies or fakes, and some are malware. Read the code before running anything.

See all 11 references on Exploit Observer

Live scores

EPSS
0.006
low predicted chance of attack
VEDAS
0.987
strong exploit evidence
On CISA KEV
Not listed
Detection rule
Nuclei · Suricata

Who is affected

ProductAffectedNot affected
appiumversion < 10.7.0Not stated

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

How to fix it

No fixed version or vendor advisory is listed in the CVE record yet. Watch the vendor’s security page.

How to detect it

Nuclei template (active check)

Appium - Cross-Site Scripting

Appium is a cross-platform automation framework for all kinds of apps, built on top of the W3C WebDriver protocol.

Name and description quoted from the template, written by VEDAS.

The template sends 1 request (GET /test/guinea-pig?throwError=%27%2balert(giyj5xzr)%2b%27); it decides using dsl matchers. Severity in the template: medium. Marked as not yet verified against a live vulnerable target.

Run it against a host you own or are authorised to test:

bash
nuclei -u https://your-host -t CVE-2026-58191.yaml
Show the template (33 lines)
yaml
id: CVE-2026-58191

info:
  name: Appium - Cross-Site Scripting
  author: vedas-arpsyndicate
  severity: medium
  description: |
    Appium is a cross-platform automation framework for all kinds of apps, built on top of the W3C WebDriver
    protocol.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-58191&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=appium&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
    cvss-score: 6.5
    cve-id: CVE-2026-58191
    cwe-id: CWE-79
  metadata:
    verified: false
  tags: cve,cve2026,appium,xss,base-driver,node
http:
  - raw:
      - |
        GET /test/guinea-pig?throwError=%27%2balert(giyj5xzr)%2b%27 HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "alert(giyj5xzr)")'
          - 'contains_all(body, "This page is a Selenium sandbox", "Appium")'
        condition: and

CVE-2026-58191.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-58191 Appium - Cross-Site Scripting. Add them to your Suricata rule set and reload.

Show the rules
suricata
alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-58191 Appium - Cross-Site Scripting"; flow:established,to_server; http.uri; content:"guinea-pig"; nocase; content:"'"; nocase; fast_pattern; classtype:web-application-attack; reference:cve,CVE-2026-58191; reference:url,https://www.exploit.observer/?keyword=CVE-2026-58191&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=appium&match=exact; sid:1010190; rev:1;)

CVE-2026-58191.rules on GitHub

References

Other references

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.

Supporting partners

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