Data theft from HTML attributes using inline CSS and ifs?

The article on PortSwigger presents a technique for data exfiltration using inline CSS styles, known as Inline Style Exfiltration. The authors discuss how attackers can exploit this method to steal information from web applications that permit style injections. It describes how HTML tags and CSS can be leveraged to send data to a malicious server while bypassing built-in security mechanisms. This technique is particularly dangerous as it operates within the existing user permissions, making it hard to detect. Furthermore, the article emphasizes the importance of security testing and validation in web applications to mitigate the risk of such attacks. Ultimately, the authors encourage close collaboration between development and security teams to protect user data from potential threats.