Security Review

Review this code for security vulnerabilities:

LANGUAGE/FRAMEWORK: [specify]

CODE:
[Paste your code]

This code handles:
- [ ] User input
- [ ] Authentication
- [ ] Database queries
- [ ] File operations
- [ ] External API calls
- [ ] Sensitive data

Please identify:
1. Any security vulnerabilities (OWASP Top 10 relevant)
2. Severity of each issue
3. Specific fixes with code examples
4. Security best practices I'm missing