How I Would Fix exposed API keys and missing auth in a Supabase and Edge Functions internal admin app Using Launch Ready.

How I Would Fix exposed API keys and missing auth in a Supabase and Edge Functions internal admin app Using Launch Ready

The symptom is usually blunt: someone finds a Supabase anon key, service role key, or Edge Function URL in the browser bundle, then realizes the "internal" admin app has no real auth gate. The root cause is almost always the same: the app shipped with trust assumptions from prototype mode, not production mode.

The first thing I would inspect is the actual access path. I want to see which routes are public, which functions are callable without a session, where secrets live in the frontend build, and whether Supabase Row Level Security is actually enforcing anything or just turned on in name only.

Triage in the First Hour

1. Check the live app in an incognito window.

• Try opening admin screens without logging in.
• Confirm whether data loads before auth completes.
• Note any direct API calls that succeed from the browser.

2. Inspect the deployed frontend bundle.

• Search for `SUPABASE_URL`, `SUPABASE_ANON_KEY`, service role keys, or hardcoded function URLs.
• Check source maps if they are publicly exposed.
• Verify that no secret is embedded in client-side code.

3. Review Supabase dashboard settings.

• Confirm Row Level Security is enabled on every table used by admin flows.
• Check policies for `select`, `insert`, `update`, and `delete`.
• Review service role usage and who can access it.

4. Audit Edge Functions.

• List all deployed functions and their triggers.
• Check whether each function validates a session or signed token.
• Confirm there is no open endpoint doing privileged writes.

5. Check logs and monitoring.

• Look for requests from unknown IPs, repeated 401/403 gaps, or unusual spikes.
• Review function invocation counts and error rates.
• Check whether unauthorized requests are being accepted silently.

6. Inspect deployment history.

• Identify when auth was last changed or removed.
• Compare recent commits for accidental exposure of env vars or policy changes.
• Roll back if a recent release widened access.

7. Review connected accounts and secrets storage.

• Verify environment variables in Vercel, Netlify, Cloudflare Pages, or your host.
• Confirm secrets are not duplicated across local files, CI logs, or preview builds.
• Rotate anything that was ever exposed.

## Quick checks I would run during triage
grep -R "service_role\|anon key\|supabase.co/functions" .
supabase db diff
supabase functions list

Root Causes

| Likely cause | How I confirm it | Business risk | |---|---|---| | Service role key used in frontend code | Search built assets and source maps | Full database access if leaked | | Missing auth middleware on admin routes | Open app in private browser and hit routes directly | Anyone can reach internal tools | | Edge Functions do not verify user identity | Call function with no session and check response | Privileged actions can be triggered anonymously | | RLS disabled or incomplete | Inspect table policies in Supabase | Data reads and writes bypass intended controls | | Over-permissive CORS or public endpoints | Review function headers and network calls | External sites can abuse endpoints | | Secrets stored in repo or preview envs | Search git history and CI logs | Keys spread beyond production control |

The most common failure is not one bug. It is a chain: a public frontend bundle plus weak RLS plus an Edge Function that trusts whatever reaches it.

The Fix Plan

I would fix this in layers so we do not trade one outage for another.

1. Freeze risky writes first.

• If an exposed key can write data, I rotate it immediately.
• If an Edge Function performs privileged actions without auth, I disable that route or add a temporary deny-by-default guard.
• For an internal admin app, availability matters less than preventing unauthorized access.

2. Separate public client code from privileged server code.

• The browser should only use the Supabase anon key.
• Anything requiring elevated permissions must move behind Edge Functions with strict authentication.
• The service role key must never ship to the client.

3. Enforce auth at the route boundary.

• Protect admin pages with session checks before rendering sensitive data.
• Require verified user identity for every privileged Edge Function call.
• For internal apps, I usually recommend email-based allowlists or organization membership checks on top of login.

4. Lock down Supabase with RLS policies.

• Enable RLS on every table used by admin workflows.
• Write explicit policies for approved roles only.
• Test both read and write paths under authenticated and unauthenticated sessions.

5. Move secrets into server-side environment variables only.

• Store API keys in deployment secrets, not repo files or client envs exposed to browsers.
• Remove any `.env` values that were copied into frontend build tooling by mistake.
• Rotate all exposed credentials after cleanup.

6. Harden Edge Functions.

• Validate JWTs or Supabase sessions before any sensitive action.
• Reject requests without expected claims or org membership checks.
• Add input validation so one bad payload does not become a destructive write.

7. Add basic abuse controls.

• Rate limit sensitive endpoints where possible.
• Log denied requests with enough context to investigate patterns later.
• Keep error messages generic so they do not reveal internals.

8. Rebuild safely and redeploy with a rollback path.

• Ship to staging first if it exists; otherwise use a short maintenance window for production updates.
• Verify admin login flow end to end before re-enabling writes fully.
• Keep the previous deploy available until smoke tests pass.

My preference here is simple: do not patch around missing auth with UI-only guards. If the backend still trusts anonymous traffic, the app is still broken even if the screen looks protected.

Regression Tests Before Redeploy

I would not redeploy until these checks pass:

• Unauthenticated users cannot load admin data from pages or functions.
• Logged-in but unauthorized users receive 403 responses on restricted actions.
• Authorized users can complete core tasks without extra friction.
• All tables holding sensitive data have RLS enabled and tested policies attached.
• No service role key appears in browser bundles, source maps, logs, or public config files.
• Every privileged Edge Function rejects requests without valid auth context.

Acceptance criteria I would use:

• 0 public endpoints allow privileged reads or writes without auth
• 100 percent of admin tables have explicit RLS policies
• 0 secrets found in built frontend assets
• p95 response time stays under 500 ms for normal admin actions after adding auth checks
• Smoke test coverage includes login, denied access, approved access, logout, and token expiry

I also want one exploratory test pass from a clean browser profile on desktop and mobile widths. Internal apps often fail at the boring edge cases: expired sessions, stale tabs, soft navigation into protected screens, and error states that still render sensitive content briefly.

Prevention

The best prevention is making security part of release discipline instead of a last-minute cleanup job.

• Code review guardrails
• Never approve frontend code that references service role credentials directly.
• Require reviewers to check authorization logic before style changes or UI polish work gets merged first.

• Security guardrails
• Use least privilege everywhere possible.
• Rotate any secret that has ever been committed or displayed in logs immediately after exposure events are discovered.

• Monitoring guardrails
• Alert on spikes in denied requests, unusual function invocations, and unexpected geographic traffic patterns when relevant to your user base.
• Track auth failures separately from application errors so you can spot probing early.

• UX guardrails
• Show clear login states instead of letting users hit blank screens or half-loaded dashboards when sessions expire again later on mobile devices too often because this creates confusion and support tickets quickly especially during demo periods when stakeholders are watching closely as well as during active sales cycles where trust matters most

• Performance guardrails
• Keep protected pages fast enough that developers do not remove auth checks "for convenience."
• Avoid heavy client-side data fetching before session validation completes because it increases both risk and wasted compute costs anyway.

A secure internal tool should feel boring to use. If people keep finding ways around login because it is annoying, then you have a product problem as much as a security problem.

When to Use Launch Ready

Launch Ready fits when you need this fixed fast without turning it into a long consulting cycle.

I would use it when:

• your internal admin app is close to shipping but too risky to expose,
• you need production deployment cleaned up before users touch it,
• secrets management is messy across environments,
• you want DNS redirects, subdomains, Cloudflare hardening, SPF/DKIM/DMARC setup,
• you need uptime monitoring plus a handover checklist so your team does not break it next week again too easily afterwards too often due to unclear ownership boundaries

What I would ask you to prepare:

• Supabase project access with billing/admin permissions
• repository access
• deployment platform access
• list of current env vars and known secrets
• any existing login rules or user roles
• one sentence describing who should be allowed into the admin area

If you want me to treat this like a rescue sprint instead of an open-ended audit call me through https://cal.com/cyprian-aarons/discovery after checking https://cyprianaarons.xyz so we can scope what needs fixing first rather than guessing live under pressure during launch week itself when mistakes get expensive quickly because support load rises immediately once real users arrive

References

• https://roadmap.sh/api-security-best-practices
• https://roadmap.sh/cyber-security
• https://roadmap.sh/code-review-best-practices
• https://supabase.com/docs/guides/auth
• https://supabase.com/docs/guides/database/postgres/row-level-security

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Take the next step

If this is a problem in your product right now, here is what to do next:

• [Use the free Cyprian tools](/tools) - estimate cost, score app risk, check launch readiness, or pick the right service sprint.

• [Book a discovery call](/contact) - I will tell you honestly whether you need a sprint or if you can DIY the next step.

*Written by Cyprian Tinashe Aarons - senior full-stack and AI engineer helping founders rescue, launch, automate, and scale AI-built products.*