The system holds their personal data in memory. You have minutes before that trust can be broken.
PII leakage prevention is not optional. Any unexpired session becomes a potential risk vector. The longer a session stays open, the greater the chance that unauthorized access or token hijacking will expose personally identifiable information. Session timeout enforcement is the simplest and most effective control you can implement to cut this risk.
A strong timeout policy starts with hard limits. Define session lifespans based on role, sensitivity, and data exposure. For high-risk operations, shorten them. Idle timeout should trigger automatic logouts, ejecting stale sessions before they can be exploited. Absolute timeout ensures a session ends regardless of activity, blocking persistent hijacks.
In real-world breach reports, weak timeout enforcement is often tied to credential compromise. Attackers leverage stolen cookies or tokens, riding an active session until manual termination. Implementing short expiration windows forces them to move faster than they can act. This drastically reduces possible leakage paths.