How to Secure Your Cursor App
Last updated: April 20, 2026
Cursor accelerates development with AI, but AI-generated code needs security review. This guide covers securing your development workflow and the code Cursor helps you write.
Why Security Matters for Cursor
Key Security Concerns
- Without Privacy Mode, code snippets are sent to Anthropic/OpenAI for suggestions
- AI may suggest hardcoded API keys or insecure authentication patterns
- Cursor Rules files (.cursorrules) could contain sensitive prompts if shared
- Tab completions happen automatically - easy to accept insecure code
- Context window may accidentally include .env files if not in .cursorignore
Security Strengths
- Desktop app (VS Code fork) - your code stays on your machine unless sent to AI
- Privacy Mode: completely disables AI features for sensitive repositories
- .cursorignore file: exclude specific files/folders from AI context
- SOC 2 Type II certified with enterprise security controls
- No major security incidents (unlike Windsurf's 94 Chromium CVEs in 2024-2025)
Step-by-Step Security Guide
1. Enable Privacy Mode for Sensitive Projects
Privacy Mode prevents your code from being stored on Cursor servers. Enable it for proprietary or client codebases.
2. Create a .cursorignore File
Exclude sensitive files from AI context. Add .env, credentials.json, private keys, and secret directories.
# .cursorignore
.env*
credentials/
secrets/
*.pem
*.key3. Review AI-Generated Auth Code
Never auto-accept authentication code. AI often suggests patterns with subtle vulnerabilities. Use established auth libraries instead.
4. Audit MCP Servers
MCP servers can execute arbitrary code on your machine. Only install from trusted sources and remove unused servers.
5. Scan Deployed Applications
After building with Cursor, scan your deployed application with vas to catch vulnerabilities in AI-generated code.
Common Security Mistakes
Avoid these common Cursor security pitfalls:
- Pasting real API keys into AI prompts
- Auto-accepting authentication code without review
- Installing unvetted MCP servers
- Not using Privacy Mode for sensitive projects
- Trusting AI-generated security implementations
Known Cursor Vulnerabilities
These are documented security issues specific to Cursor applications. Click through for detailed remediation guidance.
Recommended Security Tools
Use these tools to maintain security throughout development:
Ready to Secure Your App?
Security is an ongoing process, not a one-time checklist. After implementing these steps, use vas to verify your Cursor app is secure before launch, and consider regular scans as you add new features.
Frequently Asked Questions
Does Cursor store my code?
Cursor sends code to AI providers for processing. With Privacy Mode disabled, snippets may be stored. Enable Privacy Mode for sensitive projects to prevent storage. Check Cursor's current privacy policy for specifics.
Are MCP servers safe?
MCP servers can execute arbitrary code with your user permissions. Only install from trusted sources, review their code if possible, and remove servers you're not actively using. Treat them like any executable you install.
How do I know if AI-generated code is secure?
You can't trust AI for security-critical code. For authentication, encryption, and access control, use established libraries rather than AI-generated implementations. Run vas scans on your deployed application to catch common vulnerabilities.
Explore Related Resources
More on Cursor Security
Every angle of Cursor security, from the specific findings we detect to step-by-step fixes.
Cursor Security Scanner
Hub page: scan your Cursor app for vulnerabilities.
Cursor Security Risks
Specific risks we find in Cursor apps, with real-world examples.
Cursor Security Issues
Issues grouped by severity with detection and fix steps.
Cursor Best Practices
Remediation playbook derived from Cursor's actual failure modes.
Is Cursor Safe?
Honest assessment of Cursor's production readiness.
Cursor Security Checklist
Pre-launch checklist covering every finding class for Cursor.
Can Cursor Apps Be Hacked?
Attack vectors specific to Cursor and how they get exploited.
What People Say About Cursor Security
Community sentiment on Cursor security, compared with our scan data.