Emergent (emergent.sh) Security Best Practices
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These best practices are derived from the actual security findings we see in Emergent (emergent.sh) apps — not a generic OWASP list. Priority ordered: critical items close data-exposure gaps, high items prevent compromise, medium items reduce attack surface. Stack-specific guidance for Supabase included.
Quick Wins
Security Best Practices
#1Enable access controls on every table
criticalEmergent apps often connect to Supabase without configuring Row Level Security, leaving tables publicly readable.
Implementation
Enable Row Level Security (Supabase) or Security Rules (Firebase) on every table. For custom backends, enforce authorization at the query layer — never client-side.
-- Table created without RLS — the default in Supabase
create table public.posts (id uuid primary key, user_id uuid, content text);-- RLS on, with ownership check
create table public.posts (id uuid primary key, user_id uuid, content text);
alter table public.posts enable row level security;
create policy "Users manage own posts" on public.posts
for all to authenticated
using ((select auth.uid()) = user_id)
with check ((select auth.uid()) = user_id);#2Client-Side API Key Leakage
highThird-party API keys are embedded directly in generated frontend code instead of server-side proxies.
Implementation
Move all secrets server-side (environment variables, serverless functions). Rotate any keys previously in frontend code. Audit bundles for leftover credentials before each deploy.
#3Close: Unprotected API Endpoints
highBackend routes generated by Emergent may lack authentication middleware.
Implementation
Enforce email verification, minimum password requirements, and rate limiting on auth endpoints. Test auth flows as unauthenticated and cross-user to verify access controls.
#4Insecure Default Auth Configuration
highGenerated auth flows may skip email verification, rate limiting, and password complexity requirements.
Implementation
Enforce email verification, minimum password requirements, and rate limiting on auth endpoints. Test auth flows as unauthenticated and cross-user to verify access controls.
Common Mistakes to Avoid
Exposed Supabase Credentials with Missing RLS
Emergent apps often connect to Supabase without configuring Row Level Security, leaving tables publicly readable.
Enable Row Level Security (Supabase) or Security Rules (Firebase) on every table. For custom backends, enforce authorization at the query layer — never client-side.
Client-Side API Key Leakage
Third-party API keys are embedded directly in generated frontend code instead of server-side proxies.
Move all secrets server-side (environment variables, serverless functions). Rotate any keys previously in frontend code. Audit bundles for leftover credentials before each deploy.
Unprotected API Endpoints
Backend routes generated by Emergent may lack authentication middleware.
Enforce email verification, minimum password requirements, and rate limiting on auth endpoints. Test auth flows as unauthenticated and cross-user to verify access controls.
Insecure Default Auth Configuration
Generated auth flows may skip email verification, rate limiting, and password complexity requirements.
Enforce email verification, minimum password requirements, and rate limiting on auth endpoints. Test auth flows as unauthenticated and cross-user to verify access controls.
Verify Your Emergent (emergent.sh) App Security
Following best practices is the first step. Verify your app is actually secure with a comprehensive security scan.
Get Starter ScanFrequently Asked Questions
What's the minimum security I need for a Emergent app?
The critical-priority items above are non-negotiable for any Emergent (emergent.sh) app that handles user data: enable access controls on every table. Everything else is iterative.
Should I run a security scan before launching a Emergent (emergent.sh) app?
Yes — unconditionally. The mitigations above are specific enough that a scan proves they're implemented correctly. "I followed the checklist" isn't evidence; "the scan came back clean" is.
Is Emergent (emergent.sh) secure by default?
Emergent (emergent.sh) provides secure infrastructure, but the application-layer configuration (listed above) is the developer's job. The default state of a Emergent (emergent.sh) app before any security work typically has at least one critical-priority issue open.
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Last updated: April 2026