Session Fixation Attacks: Detection and Prevention
How session fixation lets attackers hijack sessions before login, why regenerating session IDs on auth is the fix, with examples.
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Tags: security, attacks, sessions
Session Fixation: The Attack That Reuses Your Session ID Session fixation is a web security vulnerability where an attacker forces a known session ID onto a victim's browser, then waits for the victim to log in. Once authenticated, the victim's session — with the attacker's known ID — is now privileged. The attacker can hijack it immediately. The fix is a single line of code: regenerate the session ID after every successful login. Yet this is frequently missed, making session fixation one of those vulnerabilities that persists in production systems built by developers who simply did not know about it. How Session Fixation Works Normal session behavior: Session fixation: The attacker does not need to steal a session — they planted it. How the Attacker Delivers the Known Session ID Via URL…
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