API Security Audit Automation: How Rex Guards Your Code

Why Security Must Come First, Not Last

Most startups say "build first, add security later." But fixing security flaws later costs significantly more than catching them early (per IBM Security reports). Rex validates security from the moment code is written.

Rex's Automated Security Checklist

1. API Endpoint Exposure Check

Automatically detects endpoints accessible without authentication. Verifies App Check binding on all Firebase Functions HTTP triggers.

2. Firestore Rules Validation

Auto-checks 9 patterns including wildcard matching, recursive read permissions, and admin collection exposure.

3. Environment Variable Leak Prevention

Scans every git diff for hardcoded API keys and passwords in source code.

4. Dependency Vulnerability Scan

Runs npm audit automatically and requests patches from Kai (dev) immediately when CVE score 7.0+ vulnerabilities are found.

Real Detection Cases

Security issues Rex found during recent pre-push checks:

• Webhook URL exposed in plaintext on client side → Applied AES-256-GCM encryption
• Firestore rules /users/{userId} wildcard opened sub-documents → Scoped restriction
• OAuth scope included unnecessary drive.readonly → Reduced to drive.file