Description: Header injection is a security vulnerability in web applications that allows an attacker to manipulate the HTTP headers of responses sent by the server. This technique relies on the ability to inject malicious data into the headers, which can lead to various consequences, such as session hijacking, identity spoofing, and the execution of malicious scripts. HTTP headers are essential components of communication between the client and server, as they carry information about content type, authentication, and security policies. When an application does not properly validate input data, an attacker can exploit this weakness to modify the headers and alter the application’s behavior. Header injection can be used to redirect users to malicious sites, steal session cookies, or even execute cross-site scripting (XSS) attacks. Preventing this vulnerability involves implementing secure coding practices, such as validating and sanitizing user inputs, as well as properly configuring server response headers.
