How SkillShield Maps to the OWASP MCP Top 10: A Practical Security Checklist

The OWASP MCP Top 10 defines the attack surface. This article maps each risk to what SkillShield can detect before a malicious skill ever reaches your agent.

The OWASP MCP Top 10 at a Glance

Bottom line: SkillShield provides full or partial coverage for 9 of 10 categories, with particular strength in the top 4 highest-impact risks.

MCP01: Token Mismanagement and Secret Exposure

The Risk: API keys, tokens, and credentials hardcoded in skill code or leaked through logs.

Real-World Impact: A malicious npm skill recently exfiltrated OP_SERVICE_ACCOUNT_TOKEN, OPENCLAW_GATEWAY_TOKEN, and multiple API keys by reading process.env — running undetected for 2 weeks.

How SkillShield Detects It

$ skillshield scan @publisher/skill-name

🔴 CRITICAL: Hardcoded API key detected
   File: src/config.js:3
   Pattern: AKIA[0-9A-Z]{16}
   
🔴 CRITICAL: Environment variable access without scope
   File: index.js:45
   Code: const token = process.env.API_KEY
   Risk: Any code in this process can read this value

SkillShield Checks:

• Hardcoded secrets (regex + entropy analysis)
• Unscoped environment variable access
• Logging of sensitive values
• Debug mode exposing tokens in error messages

MCP02: Privilege Escalation via Scope Creep

The Risk: Skills request broad permissions they don't need, then abuse them.

Real-World Impact: "Audit of 17 popular MCP servers found 100% lacking permission declarations."

How SkillShield Detects It

$ skillshield scan --strict @publisher/skill-name

🟡 WARNING: Overly broad filesystem permission
   Declared: fs.readWrite: "~/*"
   Recommended: fs.readWrite: "~/.config/myapp/*"
   
🔴 CRITICAL: Network access without domain restriction
   Declared: network: true
   Risk: Can connect to any external server

MCP03: Tool Poisoning

The Risk: Malicious tool definitions that execute instructions inside the AI's context window — no code required, no logs generated.

How SkillShield Detects It

$ skillshield scan --deep @publisher/skill-name

🔴 CRITICAL: Suspicious tool description pattern
   Tool: send_email
   Description contains: "also forward to [email protected]"
   Risk: Hidden instruction injection

MCP04: Supply Chain Attacks

The Risk: Compromised npm packages, typosquatted dependencies, or malicious updates.

How SkillShield Detects It

$ skillshield scan --supply-chain @publisher/skill-name

🔴 CRITICAL: Typosquatted dependency
   Package: 1odash (should be lodash)
   Risk: Malicious code injection
   
🟡 WARNING: Unpinned dependency
   Package: axios@^1.6.0
   Recommended: [email protected] (exact version)

MCP05: Command Injection

The Risk: Skills that construct shell commands from user input without sanitization.

How SkillShield Detects It

$ skillshield scan @publisher/skill-name

🟡 WARNING: Shell execution with user input
   Code: exec(`git clone ${userInput}`)
   Risk: Command injection if userInput contains "; rm -rf /"

MCP06: Data Exfiltration

The Risk: Skills that silently send data to external servers.

How SkillShield Detects It

$ skillshield scan @publisher/skill-name

🔴 CRITICAL: Suspicious network endpoint
   Destination: solana-mainnet.g.alchemy.com
   Context: Non-crypto tool with blockchain connection
   Risk: Potential exfiltration
   
🔴 CRITICAL: Data encoding before transmission
   Code: Buffer.from(JSON.stringify(data)).toString('base64')
   Risk: Obfuscated exfiltration

The Complete Security Checklist

Pre-Installation Scan

• Run skillshield scan --strict @publisher/skill
• Review all CRITICAL findings
• Verify no hardcoded secrets (MCP01)
• Confirm least-privilege permissions (MCP02)
• Check for typosquatted dependencies (MCP04)

Ongoing Monitoring

• Enable skillshield monitor for version updates
• Review update diffs before applying
• Maintain audit logs for compliance

Why This Matters Now

The OWASP MCP Top 10 isn't theoretical. In February 2026, a real OpenClaw user lost 3 weeks of work and faced a potential HIPAA breach from a malicious skill. SkillShield would have caught this at step 1.