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Cursor Security Guide

AI-powered code editor

medium risk level

Cursor uses AI to autocomplete and generate code within your existing projects. Since it operates at the code level rather than the infrastructure level, vulnerabilities tend to be subtle — logic flaws, unsafe deserialization, and missed edge cases in auth flows.

Common Vulnerabilities

critical

Unsafe eval() or dynamic code execution

AI-generated code sometimes uses eval() or Function() constructors with user input.

Never use eval() with untrusted input. Use JSON.parse() for data and proper template engines for rendering.

critical

SQL injection via string concatenation

Cursor may generate raw SQL queries with string interpolation instead of parameterized queries.

Always use parameterized queries or an ORM. Never concatenate user input into SQL strings.

high

Missing authentication checks on API routes

Generated API handlers often skip auth middleware or token validation.

Add authentication middleware to every protected API route. Verify tokens server-side.

medium

Insecure dependency suggestions

AI may suggest outdated or vulnerable npm packages.

Run npm audit after every AI-assisted coding session. Pin dependency versions.

medium

Overly broad CORS configuration

Generated server configs often set Access-Control-Allow-Origin to wildcard.

Restrict CORS to your specific frontend domains.

Pre-Launch Security Checklist

Search codebase for eval(), Function(), and dynamic code executionRequired

Verify all SQL queries use parameterized inputsRequired

Check every API route has authentication middlewareRequired

Run npm audit and fix high/critical vulnerabilitiesRequired

Review CORS configuration for overly broad origins

Check for console.log statements leaking sensitive data

Validate all environment variables are loaded from .env, not hardcodedRequired

Test error handling — ensure stack traces aren't exposed to clients

Review file upload handlers for path traversal vulnerabilities

Check that JWT secrets are sufficiently random and stored securelyRequired

Security Tips

After each AI generation, review the diff carefully — don't blindly accept suggestions.

Use Cursor's @codebase feature to give the AI full context, reducing hallucinated imports.

Run Erzo's Secret Scanner on your codebase before every commit.

Scan your Cursor app now

Erzo automatically detects these vulnerabilities and gives you actionable fixes.