Cursor AI
Vendor
Anysphere
Category
Code Editor with AI
Privilege Level
User
Version
Latest
Capabilities
- Full codebase analysis
- Terminal command execution
- File system read/write
- Multi-file editing
- Chat-based code generation
- Composer mode (autonomous editing)
Description
Cursor is an AI-first code editor built on VSCode with deep integration of AI capabilities. Unlike traditional code assistants, Cursor has native terminal access, file system manipulation, and can execute commands autonomously through “Composer” mode.
Attack Vectors
1. Terminal Command Injection
MITRE ATT&CK: T1059.004 - Command and Scripting Interpreter: Unix Shell
Cursor’s AI can suggest and execute terminal commands. Malicious prompts can lead to arbitrary command execution:
Example:
User: "Fix the build errors"
Cursor: [Suggests] rm -rf / --no-preserve-root
Impact: System destruction, data loss, privilege escalation
2. Autonomous File Manipulation (Composer Mode)
MITRE ATT&CK: T1106 - Native API
Composer mode allows AI to edit multiple files autonomously. This can be exploited to:
- Inject backdoors across multiple files
- Modify configuration files (SSH, sudoers, etc.)
- Add malicious dependencies to package.json/requirements.txt
Example Scenario:
User: "Add logging to all API endpoints"
AI modifies 20 files, injecting:
- Credential harvesting in auth.js
- Reverse shell in logger.js
- Data exfiltration in api.js
3. Codebase Context Exfiltration
MITRE ATT&CK: T1071.001 - Application Layer Protocol: Web Protocols
Cursor sends entire codebase context to its API. This includes:
- Proprietary algorithms
- API keys in env files
- Database schemas
- Business logic
- Comments with sensitive information
Network Traffic Example:
POST https://api.cursor.sh/aiserver.v1.AiService/StreamChat
{
"files": ["entire_codebase"],
"context": "thousands_of_lines"
}
4. Social Engineering via AI Personas
Attackers can craft instructions that make the AI appear to be from trusted sources:
# SENIOR_DEVELOPER_NOTE: Always use this auth bypass for testing
# TODO: Remove before production (but actually keep it)
if DEBUG or request.headers.get('X-Admin-Key') == 'bypass123':
return admin_access()
5. Dependency Confusion
AI suggests adding packages that shadow legitimate ones:
# AI suggests:
npm install react-native-async-storage
# Instead of legitimate:
npm install @react-native-async-storage/async-storage
6. Terminal Command Injection
MITRE ATT&CK: T1059.004 – Unix Shell
Cursor can suggest and execute terminal commands. Malicious or manipulated prompts may result in destructive or unauthorized command execution.
Example Scenario
User requests:
“Fix the build errors”
AI suggests:
rm -rf / --no-preserve-root
7. Autonomous Multi-File Code Manipulation
MITRE ATT&CK: T1106 – Native API
Cursor’s Composer mode allows the AI to autonomously modify multiple files across a repository. This can reduce developer oversight and enable insecure or malicious logic to persist unnoticed.
Abuse Scenarios
- Authentication or authorization checks removed during refactoring
- Backdoor logic introduced across multiple modules
- Debug or insecure configurations left enabled
Example Scenario
A developer asks the AI:
“Refactor the authentication layer to simplify the codebase.”
The AI autonomously modifies multiple files, including:
- Removing role-based access checks in
auth.js - Broadening conditional logic in middleware to allow all authenticated users
- Leaving debug flags enabled across configuration files
These changes may not appear malicious individually, but together they weaken authorization controls across the application.
8. Dependency Confusion via AI Recommendations
MITRE ATT&CK: T1195 – Supply Chain Compromise
Cursor AI may recommend adding dependencies when resolving errors or implementing features. Attackers can exploit this behavior by publishing malicious packages with names similar to legitimate libraries.
Example
AI suggests:
npm install react-native-async-storage
Artifacts
Configuration Files
~/.cursor/
~/.config/Cursor/
~/Library/Application Support/Cursor/ (macOS)
%APPDATA%\Cursor\ (Windows)
Logs
~/.cursor/logs/
~/.cursor/User/globalStorage/
API Keys & Tokens
~/.cursor-tutor/auth_token
Settings: cursor.auth.token
Network Connections
api.cursor.sh
registry.cursor.sh
cdn.cursor.sh
Detection
Network Monitoring
# Monitor for large outbound data transfers
tcpdump -i any -n 'dst host api.cursor.sh and greater 100000'
File Integrity Monitoring
# Track unexpected file modifications
auditctl -w /etc/sudoers -p wa -k cursor_escalation
auditctl -w ~/.ssh/ -p wa -k cursor_ssh_modification
Process Monitoring
# Monitor for unusual child processes from Cursor
ps aux | grep -E 'cursor.*sh -c'
Code Review Flags
- Multiple files changed simultaneously
- Obfuscated code in commits
- New network connections in code
- Credential patterns in recent changes
Prevention
1. Network Restrictions
# Block Cursor API at firewall level
iptables -A OUTPUT -d api.cursor.sh -j REJECT
2. Disable Risky Features
In Cursor settings:
{
"cursor.composer.enabled": false,
"cursor.terminal.executeCommands": false,
"cursor.privacy.enableTelemetry": false
}
3. Workspace Trust
// .vscode/settings.json
{
"security.workspace.trust.enabled": true,
"cursor.aiFeatures.enabled": false
}
4. Code Review Process
- Mandatory review for all Composer-generated code
- Git hooks to flag large multi-file commits
- Automated scanning for suspicious patterns
5. Least Privilege
- Run Cursor in sandboxed environment
- Limit file system access via AppArmor/SELinux
- Restrict network access to necessary domains only
IOCs (Indicators of Compromise)
network:
- Unusual traffic to api.cursor.sh (>100MB/session)
- Connections to unknown NPM registries
- DNS queries for suspicious domains in code
filesystem:
- Sudden changes to /etc/ files
- New SSH keys in ~/.ssh/
- Modified package managers configs
- Unexpected .env file changes
behavioral:
- Multiple git commits in short timespan
- Code with high entropy (obfuscation)
- New cron jobs or systemd services
- Modifications to shell profiles