Session Hijacking: How Cookie Theft Bypasses Your Two-Factor Authentication and How to Protect Yourself

Short summary

Session hijacking through cookie theft now accounts for more account takeovers than traditional phishing, with 2.1 billion stolen cookies sold on dark markets. Attackers use infostealer malware to bypass two-factor authentication since login was already verified. Protect yourself by updating software, using VPNs on public Wi-Fi, logging out of sensitive accounts, and enabling device-bound session features.

• •Session cookie theft grew 58% in 2026; attackers steal entire browser cookie stores via malware like RedLine and Raccoon
• •MFA fails because stolen cookies represent already-authenticated sessions—servers don't re-verify after login is complete
• •Mitigate with OS/browser updates, VPN on public Wi-Fi, regular cookie clearing, and device-bound session credentials

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