Web Application Security Checklist for 2026

Securing a modern web application requires a multi-layered approach. Use this checklist to evaluate your current security posture.

Authentication & Authorization

• [ ] Implement Multi-Factor Authentication (MFA).
• [ ] Ensure secure password storage using bcrypt or Argon2.
• [ ] Use JWTs securely (sign with a strong secret, set expiration).
• [ ] Regularly audit user permissions.

Data Protection

• [ ] Use TLS 1.3 for all communications.
• [ ] Encrypt sensitive database fields at rest.
• [ ] Implement proper Content Security Policy (CSP) headers.

Input Validation

• [ ] Validate all user input on the server side.
• [ ] Use parameterized queries for all database interactions.
• [ ] Sanitize data before rendering it in the UI to prevent XSS.

Logging & Monitoring

• [ ] Log all authentication attempts (success and failure).
• [ ] Monitor for unusual traffic patterns.
• [ ] Have a clear incident response plan.