Web Security Fundamentals Every Developer Should Know

Security isn't just the responsibility of security teams – every developer needs to understand the basics of web security to build safe applications. The good news is that following a few fundamental principles can protect you from the majority of common attacks.

Start with the OWASP Top 10, which lists the most critical web application security risks. Injection attacks (like SQL injection) can be prevented by using parameterized queries and input validation. Cross-Site Scripting (XSS) attacks can be mitigated by properly escaping output and implementing Content Security Policy headers. Always use HTTPS, implement proper authentication and session management, and never trust user input.

Authentication and authorization are particularly important to get right. Use established libraries and frameworks rather than rolling your own crypto. Implement proper password policies, consider multi-factor authentication, and use secure session management. Keep your dependencies updated, as many security vulnerabilities come from outdated third-party libraries. Remember: security is not a feature you add at the end – it needs to be built into your application from the ground up.