Security audit checklist, vulnerability patterns, and remediation guidance. Use when reviewing code for security issues, hardening an application, or performing security verification.
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Security audit checklist, vulnerability patterns, and remediation guidance. Use when reviewing code for security issues, hardening an application, or performing security verification.
version
1.0.0
Security Audit
Checklist
No secrets in source code (API keys, passwords, tokens, connection strings)
All user inputs validated and sanitized
SQL injection prevention (parameterized queries, no string interpolation)
XSS prevention (output encoding, CSP headers, no innerHTML with user data)
Authentication on all protected endpoints
Authorization checks (can THIS user perform THIS action on THIS resource?)
Rate limiting on public endpoints (login, register, password reset)
Passwords hashed with bcrypt (not MD5, SHA1, or plain text)
JWT tokens validated on every request (signature, expiry, issuer)
Sensitive data not logged (passwords, tokens, credit cards)
Dependencies checked for known vulnerabilities (npm audit)
Common Vulnerabilities
Broken Access Control: Missing auth checks, IDOR (accessing other users' data by changing IDs)
Injection: SQL, NoSQL, command injection via unsanitized inputs
Broken Auth: Weak passwords allowed, no rate limiting on login, tokens never expire
Security Misconfiguration: Default credentials, verbose error pages, unnecessary features enabled
Sensitive Data Exposure: Secrets in client-side code, PII in logs, HTTP instead of HTTPS
Reporting Format
## Security Finding: [Title]
**Severity**: Critical | High | Medium | Low
**Location**: [file:line or endpoint]
**Description**: What's wrong
**Impact**: What could happen if exploited
**Remediation**: How to fix it (specific code change)
