Description: Session fixation in JSP (JavaServer Pages) is a security vulnerability that allows an attacker to hijack a user’s session in a web application. This technique relies on manipulating session identifiers, which are used by applications to track users throughout their interaction. When a user logs into an application, they are assigned a unique session identifier, which is stored in a cookie or passed through the URL. If an attacker can predict or intercept this identifier, they can impersonate the legitimate user and access their personal information or perform actions on their behalf. Session fixation can occur in various ways, such as through phishing attacks, where the attacker tricks the victim into logging into a fake page, or by exploiting vulnerabilities in the application that allow manipulation of session cookies. This vulnerability is particularly critical in applications that handle sensitive information, as it can lead to exposure of confidential data and loss of user trust. Therefore, it is essential for developers to implement appropriate security measures, such as regenerating session identifiers after login and using secure communication protocols to protect data transmission.