Cursor Security Best Practices: Scanning AI-Generated Code Before You Ship

Cursor is the most popular AI-native IDE. It's fast, intuitive, and productive. It also generates insecure code—like every AI coding tool.

This guide helps you integrate security into your Cursor workflow without slowing down.

Cursor's strengths are also security risks:

Step 1: Secure Prompting

How you prompt affects code security.

Less secure prompts:

• "Create a login function"
• "Add database query"
• "Make an API endpoint"

• "Create a secure login function with password hashing and rate limiting"
• "Add a parameterized database query"
• "Make an authenticated API endpoint that checks user ownership"

Step 2: Review at Boundaries

You can't review every line. Focus on:

Trust boundaries:

• User input handling
• Database queries
• External API calls
• Authentication/authorization
• File operations

Step 3: Incremental Commits

Don't accumulate massive changesets:

# Bad: One massive commit
git add . && git commit -m "Add features"
# Good: Small, reviewable commits
git add auth/
git commit -m "Add login with password hashing"

Smaller commits = easier security review.

Step 4: Pre-Commit Scanning

Add a pre-commit hook that scans for obvious issues:

// package.json
{
  "husky": {
    "hooks": {
      "pre-commit": "npm run security-check"
    }
  },
  "scripts": {
    "security-check": "grep -rn 'password.*=.*["'\''']' src/ && exit 1 || exit 0"
  }
}

Step 5: PR-Based Scanning

Before merging any branch, run a full security scan.

Watch for These Autocomplete Patterns

SQL with template literals:

// Cursor often autocompletes this way
const query = SELECT * FROM users WHERE id = ${id}

Replace with:

const query = 'SELECT * FROM users WHERE id = $1'
await db.query(query, [id])

innerHTML assignments:

// Cursor follows DOM patterns
element.innerHTML = content

Replace with:

element.textContent = content

Hardcoded credentials in examples:

// Cursor generates realistic-looking keys
const apiKey = 'sk_live_abc123...'

Replace immediately with:

const apiKey = process.env.API_KEY

Authentication

> "Create a secure authentication system with: > - Password hashing using bcrypt > - Session management with httpOnly cookies > - Rate limiting on login endpoint > - Account lockout after 5 failed attempts"

Database Access

> "Create a database query function that: > - Uses parameterized queries only > - Validates input types before querying > - Returns sanitized error messages > - Logs access for auditing"

API Endpoints

> "Create an API endpoint that: > - Requires authentication via JWT > - Verifies the user owns the requested resource > - Validates and sanitizes all input > - Returns appropriate HTTP status codes > - Doesn't leak internal error details"

File Uploads

> "Create a file upload handler that: > - Validates file type using magic bytes > - Limits file size to 5MB > - Generates random filenames > - Stores files outside web root > - Scans for malware before accepting"

Enable Secure Snippets

Add to your Cursor rules:

When generating database code, always use parameterized queries.
When generating authentication, always hash passwords.
Never hardcode API keys or secrets.
Always validate and sanitize user input.

Configure Ignored Patterns

Tell Cursor to avoid generating certain patterns:

{
  "cursor.suggestions.avoid": [
    "innerHTML =",
    "eval(",
    "exec(",
    "dangerouslySetInnerHTML"
  ]
}

GitHub Actions

name: Security Scan
on: [push, pull_request]
jobs:
  scan:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Run Security Scan
        run: npx shipready scan

VS Code Tasks

{
  "version": "2.0.0",
  "tasks": [
    {
      "label": "Security Scan",
      "type": "shell",
      "command": "npx shipready scan",
      "group": "build"
    }
  ]
}

1. AI is a junior developer - It writes code that works, not code that's secure
2. Speed ≠ security - Fast iteration requires fast scanning
3. Review boundaries, not everything - Focus on trust transitions
4. Prompts matter - Security-conscious prompts yield better code
5. Automate what you can - Pre-commit hooks and CI/CD scanning

Cursor accelerates development. Security scanning ensures you don't ship vulnerabilities at the same speed.

Fast coding + fast scanning = fast AND secure shipping.