OWASP Top 10 - 2026 Edition
OWASP (Open Web Application Security Project) updates the list of 10 most common security vulnerabilities every 3 years. The 2026 version has important changes regarding AI and supply chain.
1. Broken Access Control
Users accessing resources outside their permissions.
Solution: Always check ownership before returning data.
2. Cryptographic Failures
Sensitive data not encrypted or using weak algorithms.
Solution: Hash passwords with bcrypt (cost 12), encrypt sensitive fields with AES-256-GCM.
3. Injection (SQL, NoSQL, Command)
Solution: Always use parameterized queries, validate input types with Zod.
4. Insecure Design
Solution: Use cryptographically secure tokens for password reset.
5. Security Misconfiguration
Solution: Restrict CORS to allowed origins only, use helmet.js for security headers.
6. Vulnerable Components
Solution: Run npm audit weekly, use Dependabot for auto-updates.
7. Authentication Failures
Solution: Implement rate limiting (5 attempts per 15 min), add MFA with TOTP.
8. Software and Data Integrity Failures
Solution: Use Subresource Integrity (SRI) for CDN scripts.
9. Logging and Monitoring Failures
Solution: Implement structured logging with Winston, log all security events.
10. Server-Side Request Forgery (SSRF)
Solution: Whitelist allowed domains for external requests.
Security Checklist
- All endpoints have authentication
- All sensitive data encrypted
- Use parameterized queries
- Validate all user input
- Security headers (helmet.js)
- Rate limiting for login/API
- Dependencies audited weekly
- Log security events
- HTTPS everywhere
- CSP headers configured
Conclusion
Security is not a feature, it's a foundation. Implement from the start, can't "add later".