Cursor + Firebase Security

Cursor accelerates Firebase development, but AI often generates functional code without security rules. Here's how to fix that.

Why Cursor + Firebase?

Cursor's AI can quickly generate Firebase queries, auth flows, and real-time listeners. Security Rules are complex and often overlooked.

These are the security issues we find most often in Cursor apps using Firebase.

critical

Cursor focuses on client code - Security Rules for Firestore/RTDB are rarely included.

critical

AI may suggest Admin SDK patterns that expose service credentials client-side.

high

Generated code may access data without verifying authentication status.

medium

AI may generate queries that fetch more data than needed or authorized.

Verify Firestore and RTDB have proper Security Rules, not test mode.

Scan for service account credentials in client code.

Check that authentication is verified before data access.

Review queries for appropriate data filtering.

Apply these fixes right now to improve your security.

Ask Cursor to generate Security Rules for your data model

Remove any Admin SDK usage from frontend code

Add auth state checks before all database operations

Use Firebase Emulator to test Security Rules

Limit query scope with where clauses and document paths

Cursor + Firebase is powerful, but you must manually create Security Rules. Ask Cursor to help generate rules, then test them thoroughly.

Find Security Rules misconfigurations, exposed credentials, and other vulnerabilities before attackers do.