The Bolt Security Checklist (Before Launch)
Bolt.new gets you from idea to running app fast, but its API routes often accept any origin and trust the client. A practical security checklist for Bolt apps.
Short answer: Bolt.new is the fastest path from idea to running app, and the least interested in whether the backend it just wrote is safe to expose. The UI works, the endpoint responds, the upload succeeds. Whether that endpoint accepts callers from any domain on the internet is a question Bolt rarely asks for you.
This checklist is for builders shipping a Bolt app who want the perimeter solid before they hit publish.
Where Bolt leaves gaps
API routes open to any origin
Bolt-generated /api endpoints usually accept any caller: no CORS policy, no origin checking. The moment your app is discoverable, those routes can be hit from a random domain or a script. Add origin restrictions and rate limits so your endpoints only answer to your app. The MDN CORS guide covers the mechanics.
Trust placed on the client
Forms that validate in the browser but not on the server are a billing-attack and bad-data waiting to happen: anyone can skip the UI and POST directly. Confirm validation lives on the server, where it can't be bypassed.
Generated config carrying secrets
Bolt's generated config files sometimes inline values that should be environment variables. Committed, those secrets land in your git history. Scan your repo for leaked keys and move anything sensitive into env vars.
Public bucket, private data
Storage configured for "simplicity" can quietly mean "everything readable." Confirm upload buckets aren't world-readable and that user files land where only the right users can reach them.
The Bolt pre-launch checklist
| Check | What "good" looks like |
|---|---|
| CORS / origin | API routes answer only to your app's origin |
| Rate limits | Expensive and write endpoints are throttled |
| Server validation | Inputs validated server-side, not just in the form |
| Secret hygiene | No secrets in generated config or git history |
| Storage access | Buckets private by default; uploads scoped correctly |
These sit inside the wider eight holes in vibe-coded apps; Bolt concentrates them at the API perimeter.
Verify your Bolt app
Run a free key-leak scan first, then work the table. For a full automated review (CORS, validation, config secrets, buckets), see the Bolt security audit or book a Launch scan and we'll send pull requests, not jargon.
Bolt gets you live in an afternoon. A short perimeter pass is what keeps "live" from meaning "open to everyone."
Frequently asked questions
Is Bolt.new-generated code secure?
Bolt gets you to a running app extremely fast, but it pays little attention to whether the API routes it wrote can be called by anyone, anywhere. Open CORS, client-only validation, and inlined config secrets are common. Audit the perimeter before you publish.
Do Bolt API routes have CORS protection?
Often not. Bolt-generated /api endpoints frequently accept any caller from any origin, so once your app is discoverable they can be hit from anywhere. Add origin checking and rate limits before launch.
Why isn't client-side validation enough in a Bolt app?
Because anyone can bypass the browser and call your endpoint directly. Validation that only runs in the form, not on the server, is a billing-attack and bad-data risk. Validate on the server, where it actually protects you.
How do I secure a Bolt app?
Add CORS/origin checks and rate limits to API routes, move validation server-side, pull secrets out of generated config into env vars, and lock down public storage buckets. SecuriVibe audits all four and opens pull requests.
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