Steel MCP Server

Item: Steel MCP Server
Rating: 53
Author: M8ven

MCP Server for interacting with a Steel web browser

→ steel-dev/steel-mcp-server · listed on mcp_so

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// key findings

🚨

Known vulnerabilities in dependencies: 1 critical, 3 high

Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.

🔐

You'll be asked for 1 credential: STEEL_API_KEY

These are read from process.env at runtime. Make sure you trust where they’ll be sent.

// known CVEs in dependencies1 critical3 high

Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.

critical@modelcontextprotocol/inspector@0.3.0GHSA-7f8r-222p-6f5g

MCP Inspector proxy server lacks authentication between the Inspector client and proxy

high@modelcontextprotocol/inspector@0.3.0GHSA-g9hg-qhmf-q45m

MCP Inspector is Vulnerable to Potential Command Execution via XSS When Connecting to an Untrusted MCP Server

high@modelcontextprotocol/sdk@1.0.1GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.0.1GHSA-w48q-cv73-mx4w

Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default

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// required environment variables

This server reads these from process.env. You'll be asked to provide them before it can run.

configGLOBAL_WAIT_SECONDS— (none) Optional. Number of seconds to wait after each tool action (for instance, to allow slow-loading pages).

🔐 secretSTEEL_API_KEY— "": "YOUR_STEEL_API_KEY_HERE",

configSTEEL_BASE_URL— "": "http://localhost:3000",

configSTEEL_LOCAL— "": "false",

// full audit trail

The full breakdown of what we checked, the deductions that landed, the network hosts, the dependency advisories, and concrete fix guidance is available to verified publishers.

// improvement guidance — verified publishers only

We have 2 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.

// embed badge in your README

[![M8ven Score](https://m8ven.ai/badge/mcp/steel-dev-steel-mcp-server-coww22)](https://m8ven.ai/mcp/steel-dev-steel-mcp-server-coww22)

commit: 35c2a1597be85ebaa88758dc3e4e26e8959aaf95

code hash: 92e1af03b4f7e27480a962beb89b99ff8a6969c278a4e015f29b16f1faf3bb63

verified: 6/16/2026, 12:21:45 PM

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