Cybersecurity experts have identified a growing fraud threat known as cookie theft or session hijacking, where criminals gain unauthorized access to user accounts by stealing session cookies stored on devices. In the year to June, security researchers identified 52 billion cookies in stolen data circulating online, highlighting the scope of the problem.
Session cookies are temporary digital authentication tokens generated when users log into websites and services. These cookies allow users to navigate between pages without repeatedly entering login credentials. They remain active as long as a user remains logged in or has selected options to stay remembered on a site. Security researchers describe these cookies as digital keys already turned in a lock—once obtained by criminals, they grant access without requiring the original password or triggering security alerts.
The typical infection vector involves malware inadvertently downloaded onto a user’s device. Once installed, this infostealer malware targets the browser’s database to extract active session cookies and transmit them to attackers. Victims may remain unaware of the compromise until discovering unauthorized activity, such as fraudulent transactions, unauthorized account changes, or accounts being used to deceive others through social media or email.
Security experts recommend several protective measures to reduce vulnerability. Users should be cautious when downloading browser extensions and software, monitor devices for signs of malware infection such as performance degradation or unusual battery drain, and avoid logging into sensitive accounts over unsecured public networks. Regularly logging out of accounts rather than simply closing tabs, using dedicated password managers, and clearing cookies periodically reduces the attack surface. Multi-factor authentication remains effective in most cases and should be enabled where available.
In suspected breach situations, users should run antivirus scans, log out of accounts across all devices, change passwords, and contact their financial institutions if suspicious activity is detected on banking accounts.
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