How I Would Fix exposed API keys and missing auth in a Supabase and Edge Functions subscription dashboard Using Launch Ready.

Opening

If your subscription dashboard has exposed API keys and missing auth, I would treat that as a production security incident, not a normal bug. The most likely root cause is that the frontend is calling Supabase or Edge Functions with public-facing secrets, while the functions themselves do not verify who is allowed to access billing, customer, or subscription data.

The first thing I would inspect is the request path from browser to backend: what key is in the client bundle, which Edge Functions are callable without a valid session, and whether Row Level Security is actually enabled on every table behind the dashboard. In practice, this usually shows up as "it worked in dev" and then becomes a support nightmare, data exposure risk, and possible app store or compliance problem.

Triage in the First Hour

1. Check the live site in an incognito window.

• Try opening the dashboard without logging in.
• Confirm whether any subscription data loads anyway.
• If it does, stop and assume data exposure until proven otherwise.

2. Inspect browser network calls.

• Look for Supabase anon keys in the frontend bundle.
• Confirm whether Edge Function URLs are publicly reachable.
• Check if requests return useful data without a session token.

3. Review Supabase auth settings.

• Verify Auth is enabled and configured for the right project.
• Check session handling, JWT expiry, and redirect URLs.
• Confirm whether email verification or magic link flows are bypassed.

4. Review database policies.

• Inspect every table used by the dashboard.
• Check whether Row Level Security is on.
• Confirm policies exist for select, insert, update, and delete.

5. Audit Edge Functions.

• Open each function that touches subscriptions, invoices, profiles, or billing status.
• Check for missing JWT validation or weak header checks.
• Look for hardcoded service role usage in code paths that should be user-scoped.

6. Check secrets handling in deployment.

• Review environment variables in your hosting platform and Supabase project settings.
• Make sure service role keys are never shipped to the browser.
• Verify old keys have not been left active after a previous deploy.

7. Look at logs and error traces.

• Search for unauthorized requests that still returned 200 responses.
• Find any function errors masked by permissive fallbacks.
• Check whether sensitive payloads are being logged.

8. Freeze risky changes until verified.

• Pause marketing spend if users can reach protected data unauthenticated.
• Avoid shipping UI-only fixes before backend authorization is corrected.

## Quick diagnostic checks
supabase secrets list
supabase functions list
supabase db remote status

Root Causes

1. Frontend contains a secret it should never have had.

• How to confirm: search the repo and built assets for `service_role`, private API keys, or admin tokens.
• Also inspect source maps and environment variable prefixes used by your build tool.

2. Edge Functions trust the caller too much.

• How to confirm: read function handlers for missing JWT validation or absent authorization checks against `Authorization` headers.
• If a function returns subscription data when called with no valid session, that is the problem.

3. RLS is off or incomplete on Supabase tables.

• How to confirm: check each table backing user dashboards for RLS enabled status and explicit policies.
• If users can query rows belonging to other accounts through direct SQL or API access, policies are missing.

4. Service role key is used as a shortcut in runtime code.

• How to confirm: search server code for `SUPABASE_SERVICE_ROLE_KEY` used inside request handlers without strict scoping controls.
• This key should stay server-only and only be used where full admin access is truly required.

5. Auth flow exists in UI but not enforced on backend routes.

• How to confirm: log out and hit protected endpoints directly with curl or Postman-like tools using no token at all.
• If backend still serves records or updates subscription state, UI gating is cosmetic only.

6. Deployment drift between environments.

• How to confirm: compare local `.env`, staging variables, production secrets, and Supabase project settings side by side.
• Many leaks happen because dev was secure enough but prod picked up stale values during redeploy.

The Fix Plan

My approach would be simple: lock down access first, then repair the product path so you do not create downtime while fixing security.

1. Rotate exposed keys immediately.

• Revoke any leaked API keys, especially service role keys or third-party billing secrets.
• Generate new credentials and update only server-side environments first.

2. Remove all privileged secrets from client code.

• The browser should only ever see public anon credentials designed for client use.
• Anything administrative must move behind authenticated server logic or Edge Functions with strict verification.

3. Enforce auth at the edge before any business logic runs.

• Every sensitive Edge Function should validate a real user session before reading or mutating data.
• If there is no valid identity, return 401 immediately.

4. Turn on RLS everywhere it matters in Supabase.

• Enable RLS on all user-facing tables tied to subscriptions, profiles, invoices, usage records, or entitlements.
• Write policies so users can only read rows tied to their own account ID or tenant ID.

5. Scope database queries to the current user only.

• Never query by arbitrary IDs from the client unless those IDs are checked against ownership rules first.
• Prefer joins against authenticated user identity rather than trusting request parameters alone.

6. Separate public reads from private actions.

• Public marketing pages can stay open if they expose no sensitive data.

Dashboard actions like canceling plans, changing email preferences, or viewing billing history must require auth every time.

7. Add defensive defaults in functions and UI states.

• If auth fails, show a safe error state instead of retrying with broader access or fallback admin calls.
• Do not degrade into "show something" behavior when permissions fail.

8. Clean up logs and monitoring after rotation. Remove any secret values from logs and error reports as part of the fix window so you do not keep leaking credentials through observability tools.

9. Deploy behind a narrow change set with rollback ready. I would ship this as a small security patch rather than mixing it with redesign work or feature work because that makes review harder and rollback slower.

10. Validate production after deploy from scratch account paths only Test as logged-out user., new user., existing subscriber., canceled subscriber., and blocked account so you know each path behaves correctly under real conditions

Regression Tests Before Redeploy

Before I ship this back live I would run risk-based tests focused on unauthorized access first.

• Logged-out access test
• Open every dashboard route without a session token
• Expected result: redirect to login or show 401/403
• Pass criteria: no subscription data appears anywhere

• Cross-account access test
• Use User A session to request User B's record IDs

- Expected result: deny access - Pass criteria: zero rows returned unless ownership matches

• Direct function call test

- Call each Edge Function with no auth header - Expected result: reject immediately - Pass criteria: no privileged response body

• Secret exposure test

- Search built assets for service role keys and private tokens - Expected result: none found - Pass criteria: zero matches in client bundle output

• Subscription state test

- Check active., canceled., trial., expired., past due states - Expected result: each state maps correctly to UI permissions - Pass criteria: no locked features become visible without entitlement

• Error handling test

- Break auth intentionally by expiring session tokens - Expected result: safe error message plus forced re-authentication - Pass criteria: no infinite retries., no silent fallback

• Basic security gate acceptance criteria

- No sensitive endpoint returns data without authentication - All tables holding customer records have RLS enabled - All functions touching private data validate identity before use No secrets exist in frontend code or build artifacts

Prevention

I would put guardrails in place so this does not come back two weeks later after another fast feature push.

| Area | Guardrail | Why it matters | | --- | --- | --- | | Code review | Require auth checks on every new endpoint touching customer data | Prevents "forgotten" public routes | | Secrets | Keep service role keys server-only and rotate quarterly | Reduces blast radius if something leaks | | Database | Enforce RLS by default on all tenant tables | Stops accidental broad reads | | CI | Fail builds if secret patterns appear in frontend output | Catches leaks before deployment | | Monitoring | Alert on spikes in unauthorized requests and function errors | Gives early warning before support tickets pile up | | UX | Show clear signed-out states instead of partial private content | Prevents confusing broken-dashboard behavior | | Performance | Cache only public assets; never cache personalized responses at CDN edge | Avoids leaking one user's content to another |

I would also add one simple rule to review culture: if an engineer cannot explain who is allowed to call a function in one sentence, it is not ready to ship. That one habit prevents most auth mistakes on AI-built products where speed outruns architecture discipline.

For subscription dashboards specifically, I want three numbers tracked weekly:

• Zero unauthenticated reads of private endpoints
• Zero exposed secrets in client builds
• Less than 1 percent failed auth-related requests after release

When to Use Launch Ready

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

This sprint makes sense if:

• Your app works but you do not trust its production safety yet
• You need exposed keys removed before more users sign up
• You want your dashboard deployed cleanly with monitoring attached
• You need one senior engineer to make practical decisions quickly instead of debating architecture for a week

What I would ask you to prepare:

• Supabase project access with owner-level permissions where possible
• Hosting platform access such as Vercel., Netlify., Cloudflare Pages., or similar
• A short list of all protected routes plus any billing flow notes
• Current env vars list without sharing passwords over chat if avoidable
• One sentence describing who should be able to see what inside the dashboard

My recommendation is straightforward: do not keep iterating on features until auth is fixed at the backend layer and secrets are rotated. That protects revenue,, reduces support load,, and keeps you from launching an app that looks finished but leaks customer data under pressure.

Delivery Map

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/server-side/nextjs?queryGroups=router&router=pages
• 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.*