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mcp-server-review

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更新日2026年5月17日 20:08

Security review of MCP (Model Context Protocol) server implementations and configurations. Use when auditing MCP server source code, evaluating third-party MCP servers before installation, or reviewing Claude Code MCP integrations for overpermissioning, injection risks, and data exposure.

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OWASP

OWASP/secure-agent-playbook

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MCP Server Security Review

Audit an MCP server by following the full procedure in plays/mcp-server-review.md.

Steps

Transport & Authentication — Check transport type (stdio vs HTTP/SSE), authentication on network transports, TLS enforcement, CORS policy, origin validation.
Tool Permission Audit — For each exposed tool: document what it claims to do vs what it actually does (read source). Classify as READ-ONLY, MUTATION, DESTRUCTIVE, NETWORK, or CREDENTIAL-ACCESS. Flag tools with broader capabilities than descriptions suggest, free-form inputs, or credential access.
Input Validation & Injection — For each tool parameter: check for command injection (shell interpolation), path traversal (../ in file paths), SQL injection (unparameterized queries), SSRF (user-supplied URLs hitting internal services), and template injection.
Data Exposure — Assess MCP resources for secrets/PII leakage, tool outputs for excessive data, error messages for internal paths/stack traces, and logging for sensitive data capture.
Scope & Sandboxing — Check file system restrictions, network scope (can it reach cloud metadata 169.254.169.254?), process permissions, resource limits, and dependency surface.
Supply Chain — Verify source trustworthiness, run SCA on dependencies, check for lockfiles and reproducible builds, assess update mechanism.
Client Configuration — Review MCP client config for absolute/specific server paths, minimized env var passthrough, and command injection safety in args.

Output

Server overview, tool risk matrix, findings using templates/finding.md, and specific configuration recommendations.

OWASP References

LLM01: Prompt Injection (via tool descriptions and outputs)
LLM02: Insecure Output Handling
LLM06: Excessive Agency (overpermissioned tools)
A01: Broken Access Control
A03: Injection

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name	mcp-server-review
description	Security review of MCP (Model Context Protocol) server implementations and configurations. Use when auditing MCP server source code, evaluating third-party MCP servers before installation, or reviewing Claude Code MCP integrations for overpermissioning, injection risks, and data exposure.
license	CC-BY-4.0

MCP Server Security Review

Audit an MCP server by following the full procedure in plays/mcp-server-review.md.

Steps

Transport & Authentication — Check transport type (stdio vs HTTP/SSE), authentication on network transports, TLS enforcement, CORS policy, origin validation.
Tool Permission Audit — For each exposed tool: document what it claims to do vs what it actually does (read source). Classify as READ-ONLY, MUTATION, DESTRUCTIVE, NETWORK, or CREDENTIAL-ACCESS. Flag tools with broader capabilities than descriptions suggest, free-form inputs, or credential access.
Input Validation & Injection — For each tool parameter: check for command injection (shell interpolation), path traversal (../ in file paths), SQL injection (unparameterized queries), SSRF (user-supplied URLs hitting internal services), and template injection.
Data Exposure — Assess MCP resources for secrets/PII leakage, tool outputs for excessive data, error messages for internal paths/stack traces, and logging for sensitive data capture.
Scope & Sandboxing — Check file system restrictions, network scope (can it reach cloud metadata 169.254.169.254?), process permissions, resource limits, and dependency surface.
Supply Chain — Verify source trustworthiness, run SCA on dependencies, check for lockfiles and reproducible builds, assess update mechanism.
Client Configuration — Review MCP client config for absolute/specific server paths, minimized env var passthrough, and command injection safety in args.

Output

Server overview, tool risk matrix, findings using templates/finding.md, and specific configuration recommendations.

OWASP References

LLM01: Prompt Injection (via tool descriptions and outputs)
LLM02: Insecure Output Handling
LLM06: Excessive Agency (overpermissioned tools)
A01: Broken Access Control
A03: Injection