Cross-Origin Resource Sharing (CORS) Bypass
Cross-Origin Resource Sharing (CORS) Bypass is a vulnerability in web applications that occurs when a malicious attacker is able to bypass the security mechanism of same-origin policy. Same-origin policy is a security feature in web browsers where JavaScript code from one website cannot access or manipulate resources from another website.
However, sometimes web applications need to access resources from other domains. To do this, web developers can include a CORS header that allows these requests.
A CORS bypass occurs when an attacker finds a way to trick the target website’s server into allowing a request from a different origin without the proper CORS header. This can lead to several security issues such as data theft, session hijacking, and cross-site scripting (XSS) attacks.
To prevent CORS bypass attacks, web developers should always use proper configuration and validation of CORS headers, limit the types of requests that are allowed from other origins, and use other security measures such as CSRF tokens to further protect their web applications.