Is Cursor safe to use?

Cursor is safe for most day-to-day coding, but agent mode, auto-run commands, and AI-suggested dependencies each carry real risk if left unchecked. Reviewing agent actions and scanning generated code before you ship closes most of the gap.

What are the main Cursor security risks?

The main risks are: agent mode running unintended commands (prompt injection), secrets in .env files being readable by the model even when listed in .cursorignore, AI-suggested packages that don't exist or are typosquatted, and context carrying over between unrelated projects.

How do I secure Cursor before shipping?

Disable auto-run for agent mode, review every AI-suggested command and dependency before accepting it, keep real secrets out of files the editor can read, and scan the generated code for hardcoded keys and unsafe patterns before you deploy.

Cursor

Is Cursor safe? Cursor AI security risks explained

Q: Is Cursor safe for company or enterprise code?

It can be, if the team turns on Privacy Mode, keeps secrets out of the workspace, restricts which MCP servers are allowed, requires human approval for agent commands, and scans generated code in CI before merge. Check Cursor's current security and data-retention documentation against your own compliance needs.

Q: Does Cursor send my code to AI models?

Yes. To generate suggestions, the code in your prompts and context is sent to model providers. Privacy Mode is designed to stop that code from being stored or used for training. Anything the agent can read can end up in a prompt, which is why secrets should not sit in open files.

vibesafe.info · August 15, 2026 · Updated September 15, 2026 · 10 min read

Short version: Cursor itself is safe to install — the risk comes from how agent mode is used. Here's what can actually go wrong, why it's easy to miss, and the routine that closes most of the gap before you ship.

Where the risk actually comes from

Cursor isn't insecure by design — it's an editor with a very capable AI agent attached, and that agent can read files, run terminal commands, and install packages on your behalf. Every one of those capabilities is also a way for something to go wrong if you're not watching what it does. The risk isn't "Cursor," it's "agent mode running unsupervised."

The four risks that actually show up

Agent-mode auto-run — with auto-run enabled, Cursor can execute suggested terminal commands without a human confirming each one first. A prompt-injected comment, log line, or scraped web page can steer the agent into running something you never approved.
Secrets the editor can still read — an open .env tab can be read by the model even if the file is listed in .cursorignore, since ignore rules govern indexing, not what's visible in an open editor tab.
Hallucinated or typosquatted packages — agent mode sometimes suggests installing a dependency that doesn't exist, or a real-looking name that isn't the real package. Installing without checking is a live supply-chain risk, not a theoretical one.
Context carrying between projects — long sessions and shared context can let details from one project leak into suggestions for an unrelated one, especially with multiple repos open.

Why "it worked in the editor" proves nothing

Same failure as any AI code tool: the agent optimizes for a command that completes and code that runs, not for a command you'd have approved if you'd read it carefully. Nothing about a clean terminal output tells you a suggested package was vetted, or that a secret didn't sit in an open tab during the session.

How to secure Cursor: step by step

Setting names move between Cursor releases, so look for the setting by what it does if a label has changed.

1. Make the agent ask before it acts

Turn off auto-run (sometimes called YOLO mode) so terminal commands wait for your approval. If you keep any auto-run, use an allowlist of harmless commands such as running tests, and never allow rm, piping a download into a shell, package installs or git push without a look.

2. Keep secrets out of reach

Add .env, key files and credential folders to .cursorignore, but don't treat it as a wall: close those files while the agent is working, and prefer secrets injected by your host (Vercel, Supabase, your CI) over values sitting in the repo. If a key has ever been pasted into a chat, rotate it.

3. Turn on Privacy Mode

For client or company code, enable Privacy Mode so your code isn't retained for training. On a team plan, enforce it for everyone rather than trusting each person to switch it on.

4. Treat MCP servers like installed software

Every MCP server you connect gives the agent new powers and a new source of text it will trust. Only add servers from publishers you'd trust with the same access, give them the narrowest token that works, and remove the ones you no longer use. A browsing or issue-tracker tool is exactly where a prompt-injection instruction can hide.

5. Put your security rules in the project

Add a project rules file stating your non-negotiables: secrets come from environment variables, every API route checks that the logged-in user owns the record it reads or changes, and new tables get access rules. The agent follows these far more reliably than a one-off request mid-chat.

6. Verify every new dependency

Before accepting an install, confirm the package exists on npm or PyPI, has a real history, and is spelled exactly right. Commit your lockfile so a surprise version can't slip in later.

7. Scan before it leaves your machine

Review the diff, then scan it for hardcoded keys, missing ownership checks and unsafe patterns before you commit, and again in CI before merge.

Cursor security for teams and enterprises

Enforce settings centrally — Privacy Mode and agent approval rules applied to everyone, not left to individuals.
Allowlist MCP servers — decide which tools are approved instead of letting each developer connect anything.
Keep production secrets off developer machines — short-lived, least-privilege credentials for local work.
Gate merges on a scan — a CI check catches what a tired reviewer misses, whatever tool wrote the code.
Check the paperwork — read Cursor's current security page, data-retention terms and certifications against your compliance needs rather than relying on any blog post, including this one.

Pre-ship checklist

Turn off auto-run for agent mode — review every suggested command before it executes
Keep real secrets out of files you leave open while the agent is active; use env vars injected outside the editor where possible
Check every AI-suggested package name against the real registry before installing
Start a fresh session per project for anything sensitive, instead of one long multi-repo thread
Scan the generated code for hardcoded keys and unsafe patterns before you deploy

A scanner like vibesafe.info runs that last check in about ten seconds and explains each finding in plain English — so "is Cursor safe?" becomes "yes, because I checked what it shipped."

Questions people ask about Cursor security

Is Cursor safe for company or enterprise code?

It can be, with Privacy Mode enforced, secrets kept out of the workspace, an MCP allowlist, human approval for agent commands, and a scan in CI before merge. Check Cursor's current security documentation against your own requirements.

Does Cursor send my code to AI models?

Yes, the code in your prompts and context goes to model providers to generate suggestions. Privacy Mode is designed to stop it being stored or used for training. Anything the agent can read can end up in a prompt.

Is Cursor safer than Lovable, Bolt or Replit?

Different, not simply safer. Cursor gives you more control and more ways to cause damage locally; hosted builders limit what the agent can touch but hide more of the setup. The code still needs the same checks. See our comparison.

Scan without leaving Cursor

The VibeSafe extension runs inside Cursor and VS Code, so you can scan what the agent just wrote before you commit it — plus one-click AI fixes on a free account.

Scan your code free →

No signup to try · Extension on VS Marketplace & Open VSX

An honest note. VibeSafe checks the code Cursor produces for the most common risks. It doesn't monitor agent-mode behavior inside the editor itself or replace a professional security audit for high-risk applications.