Security audits for Replit apps.
A Replit app usually ships its own server code, so its security is the security of the routes the agent wrote. We test every endpoint from the outside, check access between two real accounts, and hand you a fix for each finding.
Why it matters
Unlike builders that sit on one managed backend, a Replit app is commonly a full codebase: server routes, a database, its own authentication. That puts every classic web vulnerability in play, and the one we find most is the app checking that you are signed in but never checking that the record you asked for is yours. Sequential IDs make it worse: you do not guess, you count. We have found exactly this in apps holding bond investments, trading data and legal client files. In each case the fix was minor and the exposure was complete, and the owner had no way to see it, because from one account everything looks correct.
What you get.
Route-by-route auth review
Every endpoint checked for missing or broken authorisation, including the admin routes that verify a token is valid but never verify the caller is actually an admin.
Two-account access test
We hold two real accounts and test the relationships between them: changing IDs in requests, reading records that belong to the other account, reaching pages one of them should not see.
Secrets and configuration check
Keys and connection strings in client code, debug and config endpoints reachable without a password, and credentials that bypassed the Secrets store and ended up in the repository instead.
Database access review
Whatever your app stores data in, Postgres, Supabase or Firebase, we check that its access rules exist, that they are enforced, and that nothing privileged is callable from outside.
Authentication hardening
Rate limiting on login and password reset, password requirements, session cookie flags and which origins your app accepts requests from.
Prioritised report and free re-review
Every finding rated by severity with a concrete fix, and a free re-test once you have applied them.
How it works.
- 01
Access
You share the app's URL, a short walkthrough, and ideally read access to the code. External-only testing is possible; the code makes the audit deeper.
- 02
Test
We probe the live app from outside with real accounts and read the server code by hand, not just with automated scanners.
- 03
Report
You get a clear, prioritised write-up within days, plus a call to walk through it and the fix for each finding.
- 04
Re-review
After you apply the fixes, we verify the holes are actually closed.
Common questions.
- What makes Replit apps different to audit?
- The agent writes your server, not just your interface, so the flaws live in application logic: routes without authorisation, records addressed by guessable IDs, admin checks that do not check. Those are found by a person testing with real accounts, not by pattern-matching code.
- Will an automated scanner find these issues?
- Some of them: exposed keys, missing headers, source maps. But whether one user can actually read another's data takes two accounts and a real test. A scan can tell you a door is unlocked. It cannot tell you the vault is open, because to know that, someone has to walk in.
- What do you need from me?
- The app's URL and a short walkthrough of what it does and who should see what. Read access to the code lets us go deeper, and two test accounts speed things up, but we can create those ourselves on most apps.
- Can you fix the issues, not just find them?
- Yes. We can apply the fixes directly, or hand you a prioritised list your builder can follow. Either way we re-test afterwards at no extra cost.
- How much does a Replit security audit cost?
- It is scoped to a fixed quote up front, with no hourly meter, and typically starts around $750 depending on the size of the app. You will know the price before we begin.
Related services.
Let's build something real.
Tell us about your app or idea. You'll get a clear plan and a fixed quote back within 24 hours.