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Framework Security

Is Next.js Secure? Security Features, Risks, and Hardening

Yes, Next.js is generally secure when configured correctly. Here is what you need to know about its built-in protections, common vulnerabilities, and how to harden it for production.

Built-in Security Features

Automatic HTML escaping in JSX to prevent XSS
Built-in CSRF protection for Server Actions
Image optimization with next/image prevents image-based attacks
Automatic security headers via next.config.js
Server Components keep sensitive logic off the client

Common Vulnerabilities

Server-Side Request Forgery (SSRF) through API routes
Exposed environment variables via NEXT_PUBLIC_ prefix misuse
Insecure redirect handling in middleware
Client-side data leakage through getServerSideProps serialization
Path traversal in dynamic routes

Hardening Checklist

1Configure Content-Security-Policy headers in next.config.js
2Use middleware to enforce authentication on protected routes
3Validate and sanitize all API route inputs with zod or similar
4Never expose secrets with the NEXT_PUBLIC_ prefix
5Enable Strict-Transport-Security and X-Frame-Options headers
6Implement rate limiting on API routes
7Use next/headers for secure cookie management with httpOnly and secure flags
8Audit dependencies regularly with npm audit
9Set output: 'standalone' for minimal production builds
10Enable React Strict Mode to catch unsafe patterns

Read the complete Next.js security guide

In-depth blog post with code examples and best practices

Official Next.js security documentation

Frequently Asked Questions

Is Next.js secure?

Yes, Next.js is generally secure when configured correctly. It includes built-in protections like automatic html escaping in jsx to prevent xss. However, common misconfigurations and development patterns can introduce vulnerabilities.

What are the main security risks with Next.js?

The most common Next.js security risks include server-side request forgery (ssrf) through api routes, exposed environment variables via next_public_ prefix misuse, insecure redirect handling in middleware.

How do I harden Next.js for production?

Key hardening steps: Configure Content-Security-Policy headers in next.config.js. Use middleware to enforce authentication on protected routes. Validate and sanitize all API route inputs with zod or similar. Run a security check on your domain to identify specific issues.

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