Session Fixation Attack

    skycentral.co.uk | Session Fixation Attack

    Understanding Session Fixation Attack

    A session fixation attack is a type of web security vulnerability that allows an attacker to impersonate a legitimate user on a web application. This type of attack typically occurs on sites that use session tokens to identify and authenticate users. By exploiting session fixation vulnerabilities, attackers can gain unauthorized access to a user’s account and potentially steal their personal or sensitive information.

    How Session Fixation Attack Works

    The session fixation attack works by manipulating a user’s session identifier, which is a unique token issued by the web application to authenticate the user during their session. The attacker typically lures the victim into using a session ID that has been previously established by the attacker. This can be done through various means, such as sending a legitimate-looking link or tricking the victim into using a specific session ID through social engineering tactics.

    Effects of Session Fixation Attack

    The consequences of a successful session fixation attack can be severe. Once the attacker gains control of the victim’s session, they can carry out a range of malicious activities, including:

    • Accessing the victim’s private data
    • Performing unauthorized actions on the victim’s behalf
    • Changing the victim’s account settings
    • Committing fraud or theft using the victim’s identity

    Preventing Session Fixation Attack

    Web developers and administrators can take several steps to prevent session fixation attacks, including:

    • Using session tokens that are generated using a strong and unpredictable algorithm
    • Reissuing session tokens after a user logs in
    • Enforcing the use of HTTPS to encrypt communications and protect session tokens
    • Implementing a secure logout mechanism to invalidate session tokens
    • Regularly auditing the application for potential session fixation vulnerabilities


    Session fixation attacks pose a significant threat to the security and privacy of web application users. It is crucial for developers and administrators to be aware of the potential risks and take proactive measures to prevent and mitigate the impact of session fixation attacks. By implementing secure session management practices and staying vigilant for potential vulnerabilities, organizations can help safeguard their users against these types of attacks.