GHSA-48m6-ch88-55mj: Flowise: Improper Mass Assignment in Account Registration Enables Unauthorized Organization Association

Flowise Cloud has a mass assignment vulnerability (JSON injection, where attackers can hide malicious data in JSON input) in its account registration endpoint that allows unauthenticated attackers to inject server-managed fields like organization IDs and role assignments during account creation. This breaks trust boundaries in the multi-tenant environment (a system serving multiple separate organizations) by letting attackers associate their new accounts with existing organizations they don't own, gaining unauthorized access and escalated privileges.