Security Audit

Objective

Identify security vulnerabilities based on OWASP Top 10.

Instructions

1. Automated scan

# npm dependency audit
npm audit --audit-level=moderate

# Secret search
npx secretlint "**/*"

# Static security analysis
npx eslint --plugin security src/

2. OWASP Top 10 Checklist

#### A01 - Broken Access Control

• [ ] Authorization checks on every endpoint
• [ ] No IDOR (direct access via predictable IDs)
• [ ] CORS correctly configured
• [ ] Principle of least privilege

#### A02 - Cryptographic Failures

• [ ] Sensitive data encrypted (at rest + in transit)
• [ ] No secrets in code
• [ ] Secure hash algorithms (bcrypt, argon2)
• [ ] TLS/HTTPS enforced

#### A03 - Injection

• [ ] SQL: Parameterized queries / ORM
• [ ] XSS: HTML output escaping
• [ ] Command injection: No shell with user input
• [ ] NoSQL: Query validation

#### A04 - Insecure Design

• [ ] Server-side validation (not just client)
• [ ] Rate limiting on sensitive endpoints
• [ ] Environment separation

#### A05 - Security Misconfiguration

• [ ] Security headers (CSP, X-Frame-Options)
• [ ] No stack traces in production
• [ ] Correct file permissions

#### A06 - Vulnerable Components

• [ ] npm audit with no critical vulnerabilities
• [ ] Dependencies maintained and up to date

#### A07 - Authentication Failures

• [ ] Passwords hashed correctly
• [ ] Protection against brute force
• [ ] Secure sessions (httpOnly, secure, sameSite)

#### A08 - Data Integrity Failures

• [ ] Validation of incoming data
• [ ] Secure deserialization

#### A09 - Logging Failures

• [ ] Logs of security events
• [ ] No sensitive data in logs

#### A10 - SSRF

• [ ] Validation of user URLs
• [ ] Whitelist of allowed domains

3. Search patterns

# Potential secrets
grep -rn "password\s*=" --include="*.ts"
grep -rn "api_key\s*=" --include="*.ts"
grep -rn "secret\s*=" --include="*.ts"

# Potential SQL Injection
grep -rn "query.*\$\{" --include="*.ts"
grep -rn "execute.*\+" --include="*.ts"

# Potential XSS
grep -rn "innerHTML" --include="*.tsx"
grep -rn "dangerouslySetInnerHTML" --include="*.tsx"

# Dangerous eval
grep -rn "eval(" --include="*.ts"
grep -rn "new Function(" --include="*.ts"

4. Recommended security headers

// Express with Helmet
app.use(helmet({
  contentSecurityPolicy: {
    directives: {
      defaultSrc: ["'self'"],
      scriptSrc: ["'self'"],
      styleSrc: ["'self'", "'unsafe-inline'"],
      imgSrc: ["'self'", "data:", "https:"],
    }
  },
  hsts: { maxAge: 31536000, includeSubDomains: true }
}));

Expected output

## Security Report

### Summary
- **Overall risk level**: [Critical/High/Medium/Low]
- **Vulnerabilities found**: X
- **Vulnerable dependencies**: Y

### Critical vulnerabilities
| Severity | Category | File:Line | Description | Remediation |
|----------|----------|-----------|-------------|-------------|
| CRITICAL | A03 | auth.ts:45 | SQL injection | Parameterized query |

### Important vulnerabilities
[...]

### Priority recommendations
1. [Immediate action]
2. [Short term]
3. [Medium term]

### Dependencies to update
| Package | Version | Vulnerability | Severity |
|---------|---------|---------------|----------|
| lodash | 4.17.19 | Prototype pollution | High |

Rules

• IMPORTANT: Check all 10 OWASP categories
• IMPORTANT: Prioritize by severity
• YOU MUST propose concrete remediations
• NEVER ignore critical vulnerabilities

Think hard about every potential attack vector.

See also

Two community sources complement this skill:

• agamm/claude-code-owasp (171★, last commit 2026-04-28) — covers OWASP Top 10:2025, ASVS 5.0, and 20 language-specific quirks. Independent author. Adoption is modest at the time of this audit; the value is in pointing to a faithful implementation of the canonical OWASP standard rather than in popularity.
• semgrep official Claude plugin — Semgrep is an independent security company; their plugin integrates the static-analysis engine into Claude Code sessions for automated scanning.

When working on a security audit, install one or both alongside this skill. This skill captures the manual review workflow (when to invoke, what to escalate, blocking criteria); the OWASP skill captures the canonical attack catalogue with current 2025-2026 categories; the Semgrep plugin adds the automated scanner layer.

Install command and full list of validated vendor skills: docs/recipes/recommended-vendor-skills.md. Audit pilot trace: specs/marketplace-audit/qa-skills-pilot-2026-05-06.md.