Concurrent Session Issues
Overview
Applications without concurrent session controls allow:
- Multiple simultaneous logins from different locations (credential sharing detection fails)
- Old sessions remaining valid after logout from one device
- Session token theft goes undetected because both sessions appear valid
Remediation
- Implement concurrent session limit (configurable per user tier)
- On new login, optionally invalidate all other sessions
- Provide users with a "log out all other sessions" feature
- Track sessions per user in the database