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

6 min read · VibeSafe Blog

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 before you ship

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 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."

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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.