Cursor Security Best Practices
Use Cursor IDE safely with these essential security practices. From Privacy Mode to code review strategies.
Verify your app follows these best practices automatically.
Cursor accelerates development, but AI-generated code needs security review. These practices help you build securely while maintaining productivity.
Quick Wins
Security Best Practices
#1Enable Privacy Mode for Sensitive Projects
criticalPrivacy Mode prevents code from being sent to external AI servers. Enable it for proprietary or client code.
Implementation
Settings → Privacy → Enable Privacy Mode for workspaces with sensitive code
#2Never Paste Real Credentials in AI Prompts
criticalAnything you paste into Cursor's AI chat may be sent to external servers. Use placeholders for secrets.
Implementation
Use 'YOUR_API_KEY' or similar placeholders when asking AI for help with credential-related code
#3Review All AI-Generated Auth Code
criticalAI-generated authentication code often has subtle vulnerabilities. Never accept auth code without thorough review.
Implementation
Manually verify JWT validation, session handling, and password hashing implementations
#4Use .cursorignore for Sensitive Files
highExclude credentials and proprietary code from AI context using .cursorignore file.
Implementation
Create .cursorignore in project root, add patterns like .env*, credentials/, secrets/
#5Vet MCP Servers Before Installing
highMCP servers can execute code on your machine. Only install from trusted sources and review their code.
Implementation
Check MCP server source code, verify publisher reputation, monitor installed servers
#6Don't Auto-Accept AI Suggestions
mediumEspecially for security-sensitive code, review each suggestion before accepting. AI makes plausible-looking mistakes.
Implementation
Use Tab to accept after review, not automatic acceptance
Common Mistakes to Avoid
Pasting real API keys into AI chat
Keys are sent to AI providers and may be logged or cached
Always use placeholder values, add real keys via environment variables
Installing untrusted MCP servers
MCP servers can execute arbitrary code with your user permissions
Only install MCP servers from verified sources after reviewing their code
Trusting AI-generated security code
AI makes subtle security mistakes that look correct
Use established security libraries instead of AI-generated implementations
Verify Your Cursor App Security
Following best practices is the first step. Verify your app is actually secure with a comprehensive security scan.
Get Starter ScanFrequently Asked Questions
Does Cursor store my code?
According to Cursor's policy, code is processed but not permanently stored. However, it is sent to third-party AI providers. For maximum privacy, enable Privacy Mode which keeps all code local.
What's the MCP security risk?
MCP (Model Context Protocol) servers can execute commands and access files on your machine. This is by design - it's how MCP extends Cursor. The risk is installing malicious MCP servers that abuse this access.
Should I use Cursor for enterprise projects?
Yes, with proper controls: enable Privacy Mode, restrict MCP server installation, audit extensions, and establish code review practices for AI-generated code. Many enterprises use Cursor with these safeguards.
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Last updated: January 2026