# profullstack mcp-server OS command injection in domain_lookup

Source: https://junglewise.ai/threats/profullstack-mcp-server-os-command-injection-in-domain-lookup-92e2f301  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-09. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

Severity: low · CVSS 3.1 · Published 2026-05-09

The mcp-server package provides domain lookup functionality for checking domain availability. An unauthenticated attacker can inject arbitrary shell commands through the domain lookup API endpoints, allowing complete remote code execution on the server with full read/write file access and potential for credential theft or lateral movement.

Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Low severity, with a CVSS score of 3.1, published 9 May 2026.

**Which products and versions are affected?** @profullstack/mcp-server (npm) SEMVER:introduced=0,last_affected=1.4.12.

**Is there a fix for This vulnerability?** A patch was published on 2026-05-09: Version 1.5.0 released with fix Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is This vulnerability attacked?** It is attacked over the network, in a software library.

**Am I affected?** Check whether you run @profullstack/mcp-server (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This vulnerability is a classic OS command injection (CWE-78) in the domain_lookup module. The vulnerable code directly concatenates user-supplied domains or keywords into a shell command string without quoting, escaping, or validation, then executes it via child_process.execAsync(). Both POST /domain-lookup/check and POST /domain-lookup/bulk endpoints are affected. No authentication is enforced and the server binds to 0.0.0.0 by default. An attacker can inject shell metacharacters (semicolons, pipes, command substitution) to execute arbitrary commands as the server process UID. Proof-of-concept exploits have been demonstrated on versions ≤1.4.12; the fix in 1.5.0 replaces execAsync with execFile/spawn using argument arrays, eliminates shell interpretation, and adds input validation.

## Affected products

- profullstack mcp-server <=1.4.12

## Timeline

- 2026-05-09: disclosed
- 2026-05-09: patched: Version 1.5.0 released with fix

## References

- [https://github.com/profullstack/mcp-server/security/advisories/GHSA-v6wj-c83f-v46x](https://github.com/profullstack/mcp-server/security/advisories/GHSA-v6wj-c83f-v46x)
- [https://github.com/profullstack/mcp-server](https://github.com/profullstack/mcp-server)