X-Content-Type-Options Bypass
X-Content-Type-Options Bypass is a vulnerability in web applications that allows an attacker to bypass the content type checks performed by the browser. This can occur when a web server incorrectly declares the content type of a file or when the attacker is able to modify the content type header of a file.
For example, if a web server serves a file with the wrong content type, such as a JavaScript file with a text/plain content type, the browser may not execute the script. However, an attacker can modify the content type header of the file to text/javascript or application/javascript, allowing the script to execute, which can lead to attacks such as cross-site scripting (XSS) or code injection.
To prevent X-Content-Type-Options Bypass, web developers should ensure that the content type headers of their web pages and files are set correctly and cannot be modified by attackers. Additionally, web browsers should be configured to enforce the X-Content-Type-Options header, which instructs the browser to block any attempts to change the content type of a file.