Security guide
Is Cursor Safe? Security of Sites Built with Cursor
Cursor is different from the rest of this list: it’s a code editor with AI built in, not a platform that generates AND hosts the app. That changes the question — it’s not “does Cursor leave something open,” it’s “did the code it helped write get a real review.”
Quick answer
Cursor’s risk isn’t about the tool itself — it’s about PACE. An AI editor writes code fast enough to multiply the volume without multiplying the review. The same old failure classes still exist (secrets in code, skipped permission checks) — just now at higher volume, and committed with more confidence.
What shows up most
Secret pasted into code by the AI
Asking to “connect to API X” frequently results in the AI pasting the key straight into the file to “make it work fast” — the same universal pattern, just coming from an editor instead of an app builder.
Skipped permission checks
Fast-generated code tends to implement the requested FEATURE without necessarily implementing the “can this user actually see this?” check — the kind of gap that doesn’t show up testing the screen, only testing with two different users.
The backend you chose is still on you
Cursor doesn’t write RLS/Firebase rules on its own unless asked — and it’s often not asked, because whoever is building doesn’t know they need to ask.
No hosting of its own to scan
Since Cursor doesn’t host anything, Scanfull scans the PUBLISHED SITE, wherever it ends up — the same findings apply no matter which editor wrote the code.
Check yours
Free tools, no signup, aimed at exactly what this guide describes:
Want the full sweep?
These tools check one page and one angle at a time. The full scan crawls every page of your site and, with a verified domain, tests whether the database is actually locked down.
Run the full scan — free →