Cookie Theft: How Hackers Hijack Your Online Accounts
Session cookie theft lets fraudsters access your accounts without passwords. Here's how the attack works and why it's a growing threat.
Cybercriminals are increasingly targeting so-called "session cookies" — small data files that websites use to keep users logged in — as a way to silently take over online accounts, including those at financial institutions, without ever needing a password.
When a user logs into a bank or other online service, the website issues a session cookie that authenticates their identity for the duration of that visit. If a fraudster intercepts or steals that cookie, they can effectively impersonate the account holder and operate within the session as if they were the legitimate user, bypassing traditional login protections entirely.
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This method of attack, broadly classified as "session hijacking," is particularly dangerous because it can render two-factor authentication and strong passwords largely ineffective. Once the cookie is stolen, the attacker does not need credentials — they already hold the digital equivalent of a door key.
The threat is relevant to everyday users engaged in routine online activity. Someone completing ordinary financial tasks — reviewing balances, transferring funds, paying bills — could unknowingly have their active session compromised, leaving a window of vulnerability even after they close their browser.
Security experts emphasize that awareness of session-based attacks is the first step toward better personal defenses. Users are generally advised to avoid public Wi-Fi networks when accessing sensitive accounts, keep browsers and devices updated, and log out fully rather than simply closing a browser tab. Continue reading at Business | The Guardian.
