AI platforms · AI app builder (StackBlitz)

Is my Bolt app secure?

Bolt generates front end and back end together, which means the back end gets the same 'make it work' treatment. Express servers that answer every origin and static roots that expose the whole project are the classic Bolt findings.

Audit my Bolt app free → Scan the code too

What Bolt usually leaves open

Typical stack: Node or Next.js full-stack apps in a browser container, often with Supabase or Firebase, deployed to Netlify.

CORS allows any origin (Code Scan)app.use(cors()) with no options: the API accepts requests from any website, with your users' credentials.
Static file server rooted at the project directory (Code Scan)express.static(__dirname): the server publishes the project folder, including .env and source.
env_file_in_repo.env deployed along with the build because the assistant put secrets there and the deploy copied everything.
Cookie set without HttpOnly / Secure / SameSite (Code Scan)Session cookies set without HttpOnly, Secure and SameSite.
CORS policyThe live site's CORS header reflects any Origin, which the external audit catches even when you cannot see the code.

How to fix it in Bolt

Run the scan, then paste this into Bolt together with the Kavach report. It tells the assistant exactly what to do and what not to touch.

Paste into Bolt

Harden the server before launch. 1) Replace app.use(cors()) with an explicit allow-list of my domains. 2) Serve only a public/ folder with express.static, never the project root. 3) Move every secret to environment variables provided by the host, delete .env from the deploy and add it to .gitignore. 4) Set httpOnly, secure and sameSite on every cookie. 5) Add helmet or equivalent security headers. Show each change and keep behaviour the same.

Re-scan when it is done. The grade and the findings list show whether the change took, and monitoring tells you if a later prompt reopens anything.

Questions about Bolt security

What does Kavach find on Bolt apps most often?

Any-origin CORS, a static server rooted at the project directory, environment files shipped with the build and cookies without flags. All four are visible either from the live site or from the exported code.

Do I need to give Kavach my Bolt project?

No. The live-site audit needs only the URL. If you want the code checked too, download the project as a zip from Bolt and upload it to Code Scan; the archive is deleted the moment the scan ends.

Is Netlify hosting secure for a Bolt app?

Netlify handles TLS and the platform, not your app's headers, cookies or CORS. Those come from your code or a netlify.toml, which is where Kavach's Fix Pack points you.

How long does a scan take?

The external audit takes seconds. Code Scan handles hundreds of thousands of lines in a few minutes and reports which file and line to change.

Other platforms

Lovable · v0 · Replit Agent · Cursor · Claude Code · Supabase · Firebase · Vibe coding security scanner

Kavach reports observations from read-only checks, not guarantees; see the disclaimer. Bolt is a trademark of its owner; Kavach is not affiliated with it.