What are the most common Next.js security issues?

The most common issues are missing Content-Security-Policy headers, exposed environment variables, and missing rate limiting on API routes.

How do I add security headers to Next.js?

Add a headers() export in next.config.ts that returns an array of header objects for your routes.

Benji·March 22, 2026·8 min read

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What are the most common Next.js security issues?: The most common issues are missing Content-Security-Policy headers, exposed environment variables, and missing rate limiting on API routes.
How do I add security headers to Next.js?: Add a headers() export in next.config.ts that returns an array of header objects for your routes.

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