Mitigating OWASP Top 10 Vulnerabilities in Node.js and Next.js Web Applications

Understanding the OWASP Top 10 List

The Open Web Application Security Project (OWASP) publishes a list of the ten most critical security vulnerabilities found in web applications. These vulnerabilities—such as SQL injection, broken authentication, and security misconfigurations—are exploit entry points for attackers globally.

Securing modern Node.js and Next.js applications requires implementing security checks during development rather than waiting for an audit. This guide focuses on practical steps to mitigate these common threats.

1. Preventing Injection Vulnerabilities

Injection attacks occur when user-supplied input is executed directly as a command by the database or interpreter. To prevent SQL or NoSQL injection, always use parameterized queries or Object-Relational Mappers (ORMs) like Prisma or Mongoose, which sanitize inputs automatically.

Avoid building database query strings using string concatenation. Sanitizing inputs ensures parameter fields are treated as strings rather than executable commands.

2. Mitigating Cross-Site Scripting (XSS)

XSS attacks occur when an application renders malicious scripts into a browser without proper sanitization. Next.js natively escapes variables output in JSX to protect against standard XSS attempts. However, using dangerouslySetInnerHTML bypasses this protection.

If you must render rich HTML, sanitize the payload first using libraries like DOMPurify to strip out malicious tags like <script> or event handlers like onload.

Conclusion

Hardening web applications requires preventing input injection, sanitizing rich HTML outputs, and configuring secure cookies. Aligning your dev workflows with OWASP guidelines keeps client data secure.