Session fixation is a cyberattack where a hacker tricks a user into using a session ID that the hacker already knows. Once the user logs in with that session, the hacker can use the same session ID to access the account.
Normally, websites create a new session ID after you log in. However, if the website does not handle sessions properly, a hacker may be able to set a session ID before login and then reuse it later.
For example, a hacker may send a fake login link with a fixed session ID hidden inside it. If the user clicks the link and logs in, the hacker can use the same session information to access the account.
This attack is dangerous because the victim may never notice anything unusual. Their password is not stolen directly, but the hacker still gains access to the account.
Session fixation attacks are more likely on websites with weak session management, outdated software, or poor security practices. Public computers and shared devices can also increase the risk.
To stay safe, always log out after using important accounts and avoid clicking unknown login links. Clearing browser cookies regularly can also help remove old session data.
Websites should create a completely new session ID after login and logout. This makes it harder for attackers to reuse old sessions.
Keeping browsers updated and enabling two-factor authentication can also reduce the risk of session fixation attacks.
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