CVE-2026-84201 appium-mcp-server through 0.1.61 Path Traversal in write_file and write_files_batch
Attackers can write arbitrary files outside the project root via path traversal in write_file tools, potentially overwriting configuration files to execute code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-84201?
CVE-2026-84201 is a medium-severity path traversal vulnerability in argneshu appium-mcp-server, published on 1 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
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.
Weakness: CWE-22
Which versions are affected by CVE-2026-84201?
How do I fix CVE-2026-84201?
No fix has been published for CVE-2026-84201 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-84201 being exploited?
There is no known exploitation of CVE-2026-84201 in the wild and no public exploit code.
Sources
Also known as GHSA-j4m2-645j-49qh.