How to Secure a Web Application: An OWASP Checklist

The OWASP Top 10 is a list of the most common web application vulnerabilities. Go through it before release: most real-world breaches exploit exactly these gaps.

The Main Risks and Their Defenses

• Injections (SQL/NoSQL) → parameterized queries and strict input validation.
• Broken authentication → strong passwords, 2FA, and brute-force protection.
• Data exposure → encryption, HTTPS, and minimizing the data you store.
• Misconfiguration → close unnecessary ports, hide versions, and set security headers.
• XSS → output escaping and a Content Security Policy.
• Insecure dependencies → regular updates and package auditing.

Access Control

Check permissions on the server for every operation, not just in the interface. A hidden admin URL is not protection.

Logging and Monitoring

Record suspicious activity and set up alerts. The sooner you notice an attack, the smaller the damage.

Rate Limiting

Limit the rate of requests to login, registration, and order forms — this protects against brute force and spam.

Conclusion

Security is built in during development. Go through the OWASP checklist, then commission an audit and a pentest for an independent verification.