Multi-Tenant Data Isolation: How to Prevent Data Leaks Between Customers
Multi-tenant SaaS applications serve multiple customers from a shared infrastructure, making data isolation critical. Implement row-level security using organization IDs on every database query, enforce tenant context at the middleware layer before any data access, use separate encryption keys per tenant for sensitive fields, and audit all cross-tenant access attempts. A single data leak between tenants can destroy customer trust and trigger regulatory penalties under GDPR and SOC 2.