Cursor, honestly.
Cursor is the tool we respect most on this list: it produces a real codebase in your own repo. That changes the ownership question. It does not change the security one.
The professional's option.
- A real repo from day one: standard code any engineer can pick up, diff and hire against. No walled garden.
- Speed for people who can read code: an experienced builder ships multiples faster with it.
- Works with any stack: your framework, your infra, your conventions.
- The natural bridge from vibe-coding to real engineering. Apps that start here are the easiest to take to production.
It clears the bar of running. Production is higher.
- Volume: Cursor writes more unreviewed code than any team can read, and unreviewed is the operative word.
- Authorization logic is where models guess wrong most: permissive APIs, checks that only exist client-side.
- Verbose errors and default-open settings leak internals.
- Without tests, a fast-moving Cursor codebase regresses silently, same as any AI builder.
Two layers: the code, and the tool itself.
- 45% of AI-generated code introduces an OWASP Top 10 vulnerability, and AI failed to stop XSS in 86% of relevant samples (Veracode, 2025). Cursor runs on those same models.
- Secrets: keys prefixed
NEXT_PUBLIC_orVITE_ship in the bundle, and tokens get committed into git history. - Rules File Backdoor (Pillar Security, 2025): hidden Unicode in a rules file can steer the agent into writing malicious code, and it survives forks. Review rules files like executable code.
- MCPoison, CVE-2025-54136 (CVSS 7.2): Cursor tied MCP trust to a name, not contents, so an approved entry could be swapped for a malicious command. Fixed in Cursor 1.3. Keep Cursor updated and re-review MCP configs when they change.
- The full sequence we run is in our guide on auditing AI-generated code.
When the repo outgrows one reader.
Call us when the codebase has grown past what you can review yourself, when auth or payments are about to go live, or when diligence is coming and you need the repo to survive a professional read. The $500 Week-1 Build Audit covers the code and the toolchain and is credited against any build. The Go-Live Intensive takes it live from $14,000.
Is Cursor safe to use?
Safe to build with, not safe to ship from blindly. Treat output as a draft: audit access control, secrets and input handling before production, and lock down Cursor's own rules-file and MCP trust settings.
Has Cursor itself had security vulnerabilities?
Yes. Pillar Security disclosed the Rules File Backdoor, where hidden Unicode in a rules file steers the agent into writing malicious code. Check Point reported MCPoison (CVE-2025-54136), fixed in Cursor 1.3. Keep the editor updated.
Is code generated by Cursor secure by default?
No. It runs on the same models as other AI assistants, and roughly 45% of AI-generated code introduces an OWASP Top 10 vulnerability. Expect access-control gaps, exposed secrets and injection holes until someone audits and fixes them.
$500 Week-1 audit · credited against any build