Deep Security Q&A

CORS Misconfiguration

Comprehensive questions and answers about CORS security, common misconfigurations, and proper implementation.

Security Overview

3
Urgent Topics
1
Warning Topic
2
Informational Topics

Questions & Answers

Best Practices

CORS Configuration

  • Always explicitly list allowed origins, never use wildcards for sensitive APIs
  • Validate Origin headers against an allowlist before reflecting
  • Use environment variables for origin lists in different environments

Additional Security Measures

  • Implement CSRF protection alongside CORS for authenticated requests
  • Use SameSite cookie attributes to prevent cross-site request forgery
  • Regularly audit CORS configurations as part of security reviews