Multi-Tenant Boundary Lab: Stop One Customer Seeing Another Customer's Data

Multi-tenant bugs are high-impact because one missing condition can expose the wrong data. Participants attack a small tenant-based app through list views, direct URLs, exports, search, background jobs, and admin screens to find where isolation fails.

The lab focuses on practical defenses: tenant-scoped queries, authorization tests, safe admin impersonation, audit logs, and review checklists. The goal is to make data boundaries visible and testable instead of assumed.