---
id: CVE-2026-84201
title: >-
  appium-mcp-server through 0.1.61 fails to validate or normalize file paths in
  the write_file and write_files_batch tools, allowing attackers to write files
  outside the intended PROJECT_ROOT directory
summary: >-
  appium-mcp-server through 0.1.61 fails to validate or normalize file paths in
  the write_file and write_files_batch tools, allowing attackers to write files
  outside the intended PROJECT_ROOT directory. Attackers can supply absolute
  paths …
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H'
cwe:
  - CWE-22
published: '2026-09-01'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:18:59.270'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84201'
references:
  - url: >-
      https://github.com/argneshu/appium-mcp-server/blob/92b5c2b325e7bdd124f1f41a6049028b2a44e89c/src/mcp_server.py
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/argneshu/appium-mcp-server/blob/92b5c2b325e7bdd124f1f41a6049028b2a44e89c/src/tools/write_files_batch.py
    label: disclosure@vulncheck.com
  - url: 'https://www.npmjs.com/package/appium-mcp-server'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/appium-mcp-server-through-0.1.61-path-traversal-in-write-file-and-write-files-batch
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00144
epssPercentile: 0.04058
ingestedAt: '2026-09-08T21:11:12.289Z'
---

## Overview

appium-mcp-server through 0.1.61 fails to validate or normalize file paths in the write_file and write_files_batch tools, allowing attackers to write files outside the intended PROJECT_ROOT directory. Attackers can supply absolute paths or relative paths with parent directory segments to overwrite arbitrary files with the server user's privileges, including shell profiles and configuration files in the home directory.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.