Security Standard
MCP Server Security Standard (MSSS): an open, testable security control standard for certifying MCP servers, with levels, evidence requirements, and reporting schemas.
What is Security Standard?
Security Standard is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to mcp server security standard (msss): an open, testable security control standard for certifying mcp servers, with levels, evidence requirements, and reporting schemas.
MCP Server Security Standard (MSSS): an open, testable security control standard for certifying MCP servers, with levels, evidence requirements, and reporting schemas.
This server falls under the Security category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- MCP Server Security Standard (MSSS): an open, testable secur
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx security-standardConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use Security Standard
The MCP Server Security Standard (MSSS) is an open, community-driven specification framework that defines testable security controls for certifying MCP server implementations. It organises 24 security controls across eight domains — Filesystem, Execution, Network, Authorization, Input Validation, Logging, Supply Chain, and Deployment — into four compliance levels (L1 to L4) suited for different risk profiles, from personal hobby tools up to regulated enterprise deployments. The project provides JSON reporting schemas so developers can document evidence of compliance, and deployment profiles that map controls to common scenarios such as Local Dev, Team Server, and Internet-Facing. It is a reference standard for auditing existing MCP servers or designing new ones with built-in security hygiene.
Prerequisites
- Familiarity with MCP server architecture and how MCP servers are deployed
- Node.js or your server's runtime environment for running any provided code example schemas
- An MCP-compatible client (Claude Desktop, Cursor, etc.) if you intend to test a server against the standard
- Access to the repository at https://github.com/mcp-security-standard/mcp-server-security-standard
Clone the specification repository
Clone the MSSS repository to read the full standard, JSON schemas, and code examples locally.
git clone https://github.com/mcp-security-standard/mcp-server-security-standard.git
cd mcp-server-security-standardChoose a compliance level for your server
Review the four compliance levels: L1 (Essential — personal tools), L2 (Standard — team servers), L3 (Enhanced — customer-facing apps), and L4 (Advanced — regulated industries). Select the level that matches your deployment risk profile.
Review the eight security domains
Examine the 24 controls spanning Filesystem (path allowlisting), Execution (no shell execution), Network (URL validation), Authorization (OAuth), Input Validation, Logging, Supply Chain, and Deployment. Each control lists test criteria and evidence requirements.
Run the controls checklist against your server
For each control at your chosen level, execute the provided test criteria (e.g., attempt path traversal attacks, verify environment variable injection is blocked, confirm audit logs are produced) and collect evidence artefacts.
Generate a compliance report using the JSON schema
Use the provided JSON reporting schema to document your findings. Fill in each control's status (pass/fail/not-applicable) and attach evidence references.
{
"server": "my-mcp-server",
"level": "L2",
"controls": [
{ "id": "FS-01", "status": "pass", "evidence": "path allowlist enforced in src/fs.ts" },
{ "id": "NET-01", "status": "pass", "evidence": "URL schema validated against allowlist" }
]
}Security Standard Examples
Client configuration
This repository is a specification, not a runnable MCP server. If you build a compliant server based on the standard, configure it in Claude Desktop like any other MCP server.
{
"mcpServers": {
"my-compliant-server": {
"command": "node",
"args": ["build/index.js"],
"env": {}
}
}
}Prompts to try
Use Claude to help you audit a server against the MSSS by sharing the specification and your server's source code.
- "Review this MCP server code against MSSS Level 2 controls and identify any gaps"
- "Generate a compliance checklist for an MCP server that handles user file uploads"
- "What MSSS controls apply to an internet-facing MCP server with OAuth authentication?"
- "Write a test suite that validates FS-01 (path allowlisting) for my MCP file server"Troubleshooting Security Standard
Unsure which compliance level applies to your deployment
Consult the deployment profiles in the repository. L1 covers personal/hobby tools with no sensitive data, L2 covers shared team tools, L3 covers customer-facing applications, and L4 targets regulated industries requiring HIPAA or PCI DSS compliance.
The JSON reporting schema does not validate in your tooling
The schemas are licensed under Apache 2.0 and reside in the /schemas directory. Validate against the schema file directly using ajv or another JSON Schema validator to identify which fields are missing or malformed.
A control test requires capabilities your server intentionally omits
Mark the control as 'not-applicable' in your report and document the architectural reason (e.g., 'server is read-only so write-path controls do not apply'). The standard allows justified exemptions with documented rationale.
Frequently Asked Questions about Security Standard
What is Security Standard?
Security Standard is a Model Context Protocol (MCP) server that mcp server security standard (msss): an open, testable security control standard for certifying mcp servers, with levels, evidence requirements, and reporting schemas. It connects AI assistants to external tools and data sources through a standardized interface.
How do I install Security Standard?
Follow the installation instructions on the Security Standard GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with Security Standard?
Security Standard works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is Security Standard free to use?
Yes, Security Standard is open source and available under the CC-BY-SA-4.0 license. You can use it freely in both personal and commercial projects.
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