This article discusses a web security vulnerability related to Cross-Site Scripting (XSS) in a portswigger lab, demonstrating how improper handling of user input can lead to script injection. It emphasizes the importance of sanitizing or safely handling dynamic content in web applications to prevent malicious exploits. #DOMXSS #JavaScriptInjection
Keypoints
- The lab demonstrates a vulnerability where user input is inserted into the DOM using innerHTML without proper sanitization.
- Using innerHTML to insert user input can lead to XSS if the input contains HTML or JavaScript code.
- The payload <img src=11 onerror=alert(1)> successfully triggered an alert, showing an XSS exploit example.
- Replacing innerHTML with textContent is a recommended mitigation to prevent script execution.
- Proper sanitization or encoding of user input is crucial to secure web applications against XSS attacks.