Cross-Origin Resource Sharing (CORS) is a security feature implemented by web browsers to prevent malicious websites from accessing resources and data from another domain without permission. It acts as a safeguard against certain types of cyber attac...

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José Pablo Ramírez Vargas
Senior Software Developer @ Intel
CORS is in no way a critical component of web security. If anything, CORS is a major pain for web developers. CORS does not prevent unauthorized access, does not prevent data breaches and instead it bugs the web developers over nothng. Only web browsers respect CORS because CORS' major fault is that is a client-side "security" measure. This means that you can (very easily) use a client that does not follow the rules. The perfect example is Postman. So where is the security? Nowhere to be found.