Session Cookie Monitoring: Detect Stolen Sessions Before Attackers Use Them
Constella Intelligence, Thursday, June 25th, 2026
Attackers increasingly steal session cookies to bypass MFA, making cookie monitoring essential.
Attackers are increasingly targeting session cookies rather than passwords, as shown by malicious Chrome extensions harvesting authentication tokens every 60 seconds.
Stolen session cookies bypass traditional controls like MFA and access restrictions because they represent already-authenticated users.
With 51.7 million infostealer packages processed in 2025, organizations face exposure through employee personal devices accessing corporate SaaS platforms.
The piece advocates dedicated cookie monitoring that detects compromised sessions in underground marketplaces so teams can invalidate tokens before exploitation.
Security teams should extend monitoring beyond corporate endpoints and establish immediate session invalidation as their response protocol.