Guide
Is an app built with Cursor secure?
An app built with Cursor is as secure as the review you give it, because Cursor writes code that works without guaranteeing it is safe. The exposures that show up most are hardcoded secrets, missing backend access rules, and keys that belong on the server ending up in the browser.
The reviewer is you now
Cursor is a coding assistant, so it writes what you ask and fills gaps with plausible code. Plausible code can still hardcode a secret, skip an auth check, or trust input it should not. When AI writes more of the app, the human review that used to catch this has to be deliberate, because it no longer happens by default.
Treat anything an AI writes as a draft that needs a security review before it goes live.
What to look for
- Hardcoded secrets in the committed code or the shipped bundle.
- Backend rules that were never set, so the database is open even though the app looks locked.
- Server keys in client code, the classic copy of a service-role or admin key into the frontend.
- Verbose errors and exposed source maps that leak how the app is built.
A fast outside check
Once the app is deployed, the fastest safety check is from the outside. Plaintext reads your live URL the way a browser does and reports what is exposed, so you catch the issues that made it past review before someone else does.
Frequently asked
Is AI-generated code secure?
AI-generated code is functional but not guaranteed secure. It can hardcode secrets, skip access checks, or leave backend rules unset. Treat anything an AI writes as a draft that needs a security review before it goes live.
How do I secure a Cursor-built app?
Move every secret into server-side environment variables, set access rules on your database, and confirm no server keys shipped to the browser. Then scan the live URL to catch anything the review missed.
Check your own app in about a minute. Paste your URL and Plaintext reads the shipped JavaScript, the public endpoints, and the database rules for the exact holes AI coding assistants leave open. The first scan is free.
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