Firebase
Supabase

Firebase vs Supabase Security

Firebase and Supabase are the two most popular Backend-as-a-Service platforms. Their security models differ but both require explicit configuration.

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Security Comparison

Category
Firebase
Supabase
Security Model
Security Rules (JSON)
Row Level Security (SQL)
Default State
Test mode is insecure
RLS disabled by default
Real-time Security
Rules apply to real-time
RLS applies to real-time
Auth Integration
request.auth in rules
auth.uid() in policies
Testing Tools
Firebase Emulator Suite
SQL queries + VAS
Database Power
NoSQL (Firestore)
Full PostgreSQL

The Verdict

Both platforms are secure when configured correctly. Firebase offers better testing tools; Supabase offers more powerful database features.

Whichever you choose, security configuration is not optional. Use VAS to verify your rules/policies are working as expected.

Industry Security Context

When comparing Firebase vs Supabase, consider these broader security trends.

10.3%

of Lovable applications (170 out of 1,645) had exposed user data in the CVE-2025-48757 incident

Source: CVE-2025-48757 security advisory

91%

of data breaches involve databases with misconfigured access controls

Source: Verizon Data Breach Investigations Report

4.45 million USD

average cost of a data breach in 2023

Source: IBM Cost of a Data Breach Report 2023

Vibe coding your way to a production codebase is clearly risky. Most of the work we do as software engineers involves evolving existing systems, where the quality and understandability of the underlying code is crucial.

Simon WillisonSecurity Researcher, Django Co-creator

Using Firebase or Supabase?

Regardless of which platform you choose, VAS scans for security issues specific to your stack.

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