CORS Security Guide: What Cross-Origin Sharing Controls
How CORS works, what wildcard origins allow, how preflight requests work, and the CORS misconfigurations that create real vulnerabilities.
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Tags: security, web, cors
CORS Security: Wildcards, Credentials, and Preflight Explained CORS (Cross-Origin Resource Sharing) is a browser security mechanism that controls how web pages can make requests to a different origin. It is widely misunderstood, frequently misconfigured, and the source of both frustrating developer errors and real security vulnerabilities. This guide explains why CORS exists, what the dangerous patterns are, and how to configure it correctly. Why CORS Exists: The Same-Origin Policy The Same-Origin Policy (SOP) is a browser security rule: JavaScript on cannot make HTTP requests to and read the response. Two URLs have the same origin only if their scheme, host, AND port are identical. Without SOP, malicious websites could make requests to your banking site using your credentials and read…
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