Vulnerability · Published Sep 1, 2026 · Assigned by VulnCheck

CVE-2026-84201appium-mcp-server through 0.1.61 Path Traversal in write_file and write_files_batch

High 7.1

In plain English

A high-severity path traversal in appium-mcp-server from argneshu. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)0.2%top 91.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
argneshu	appium-mcp-server	0 – through 0.1.61

Weakness: CWE-22 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

References

https://www.npmjs.com/package/appium-mcp-server product
https://github.com/argneshu/appium-mcp-server/blob/92b5c2b325e7bdd124f1f41a6049028b2a44e89c/src/mcp_server.py technical-description
https://github.com/argneshu/appium-mcp-server/blob/92b5c2b325e7bdd124f1f41a6049028b2a44e89c/src/tools/write_files_batch.py technical-description
VulnCheck Advisory: appium-mcp-server through 0.1.61 Path Traversal in write_file and write_files_batch third-party-advisory