mailbox-mcp

MCP server for inter-agent mailbox communication using file-based mailboxes in .claude directories.

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// key findings

⚠️

Known vulnerabilities in dependencies: 2 high

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

✅

No credential exfiltration, no sensitive file access, no obfuscation

Static analysis found nothing flowing your secrets to unexpected places.

✅

Open source with a license and README

Anyone can audit the code, the license is declared, and the publisher documents what it does.

// known CVEs in dependencies2 high3 low

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

high@modelcontextprotocol/sdk@1.0.0GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.0.0GHSA-w48q-cv73-mx4w

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

lowjs-yaml@4.1.0GHSA-h67p-54hq-rp68

JS-YAML: Quadratic-complexity DoS in merge key handling via repeated aliases

lowjs-yaml@4.1.0GHSA-mh29-5h37-fv8m

js-yaml has prototype pollution in merge (<<)

lownanoid@5.0.0GHSA-mwcw-c2x4-8c55

Predictable results in nanoid generation when given non-integer values

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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.

configMAILBOX_MCP_AGENT_ID

configMAILBOX_MCP_CONFIG

// 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 5 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/ellgree-mailbox-mcp-1eg09y)](https://m8ven.ai/mcp/ellgree-mailbox-mcp-1eg09y)

commit: e516a9ba75fb23446ea8cff44d00efbc067f590f

code hash: 5e5042b254a86b9e03c018e9bbb60c1fef9095e0144344f2970cccbd71f5a254

verified: 7/8/2026, 8:43:03 AM

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