Bolt security audit
Using Bolt? Here’s what usually breaks security.
Bolt is built for getting an MVP into the world this afternoon. The same speed that makes it useful skips the unsexy work — webhook signing, rate limits, session expiration. These are the most common security debts we see Bolt apps ship with.
Common problems
What we keep finding in Bolt codebases.
Insecure generated APIs
Endpoints generated for “CRUD on a thing” rarely include ownership checks. Any authenticated user can read, update, or delete any row by guessing or enumerating IDs.
ExamplePATCH /api/posts/42updates a post regardless of who actually owns it — there’s nowhere author_id = ?.Missing rate limits
Login, signup, password reset, and AI-backed endpoints ship without throttling. Credential stuffing and abuse are essentially free.
Unprotected webhooks
Webhook handlers accept any POST to the public URL without verifying the signature header. Anyone who finds the URL can trigger payment events.
Weak session management
Sessions never expire. Logout doesn’t revoke. Password change doesn’t invalidate other devices.
Prompt fixes
What to tell the model.
Paste these into your next conversation. They steer generation toward safer defaults — but they aren't a substitute for review.
For: Insecure generated APIs
“Validate object ownership on every read, update, and delete. Never trust the ID parameter alone.”
For: Missing rate limits
“Add request throttling on auth, reset, and any expensive route. Use a fixed window or token bucket scoped per IP and per user.”
For: Unprotected webhooks
“Verify webhook signatures (Stripe, Clerk, Resend, etc.) on every request. Reject anything missing or mismatched before reading the body.”
For: Weak session management
“Enforce session expiration, server-side revocation on logout, and full session invalidation after any credential change.”
Manual verification
The Bolt checklist.
Run through each item by hand before you ship. If anything is unclear, treat it as a red flag, not a green light.
- Hit /api/<resource>/<id> as user A for a row owned by user B.
- Send a webhook with a tampered signature and confirm a 400.
- Run 1000 logins/sec against the auth endpoint and confirm rate limiting.
- Test that logout actually revokes the session on the server.
- Confirm sessions expire after a sensible inactivity window.
If issues are already live
Damage control, in order.
If you suspect any of the above already shipped to real users, work the list top-to-bottom. Don’t skip rotation.
- 1Add ownership checks before doing anything else.
- 2Rotate webhook signing secrets and require signature verification.
- 3Add throttling on auth and reset endpoints.
- 4Force a global session reset.
- 5Audit logs for object access by users who shouldn’t have had it.
Why AI-generated fixes still fail
The model that wrote the bug rarely sees it.
Same blind spots
The patterns that produced the vulnerability are baked into the model's training. Asking it to audit itself reproduces the same assumptions.
Context windows lie
The model sees the file you paste, not your auth middleware, your RLS policies, or the route you forgot to protect. It can't review what it can't see.
Confidence ≠ correctness
AI fixes look polished and read well. That's a signal of fluency, not of safety. Real verification needs a human who can hit the endpoint.
Don’t ask AI to audit AI
You wouldn’t let an intern grade their own homework.
Most builders type “is this secure?” back into the same chat that wrote the code. You need independent verification — someone whose context isn’t poisoned by what just got generated. That’s Kleared.
Bolt ships MVPs fast. Kleared makes sure they survive production.
A single Launch Audit catches the four mistakes above on day one — with PRs, not just findings.
Before you launch
Run a real human security review.
Not another prompt. Kleared checks the boring stuff that breaks production:
- auth
- permissions
- secrets
- uploads
- database exposure
- API security
- payment flows
- production configs
So you can ship without guessing.