Multi-tenant SaaS applications serve multiple customers on shared infrastructure. Tenant isolation testing systematically verifies that Customer A cannot access Customer B's data across every access path: API endpoints, search functionality, file storage, database queries, caching layers, logging, and error messages. This requires understanding the application's tenancy model and testing every data access mechanism with credentials from different tenants.
Technical2026-10-24
SaaS Multi-Tenant Data Isolation Testing — 日本企業向けガイド
In multi-tenant SaaS, one customer must never access another's data. How to systematically test tenant isolation across every access path. Guidance for JP market.