Day 10 of 30 Days — 30 Vulnerabilities | Cross Origin Resource Sharing (CORS) Misconfiguration

Day 10: Cross Origin Resource Sharing (CORS) Misconfiguration — Essential Tricks & Techniques Based on Personal Experience and Valuable POCs

[ In collaboration with Abhijeet Kumawat ( his LinkedIn | Twitter)]

Hey geeks, it4chis3c (Twitter) here with one more write-up on tricks & tips to detect Cross Origin Resource Sharing (CORS) Misconfiguration vulnerability.

1. Brief Description

Cross-Origin Resource Sharing (CORS) is a security feature implemented by web browsers to prevent websites from making unauthorized requests to a different domain than the one that served the original web page. While CORS is essential for web security, misconfigurations in its implementation can expose web applications to significant security risks. These misconfigurations occur when CORS policies are too permissive, allowing malicious websites to access sensitive data from a different origin.

2. Where to Detect

CORS misconfigurations are often found in the HTTP headers of web applications. The Access-Control-Allow-Origin header is particularly crucial, as it dictates which domains are allowed to access resources from a server. Misconfigurations can occur if this header is set to a wildcard (*), or if it improperly specifies trusted domains. It's essential to analyze these headers in web applications that handle sensitive…