CVE-2026-46441

### Summary A Mass Assignment vulnerability exists in the assistant update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating an assistant resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign assistants to arbitrary workspaces. This breaks tenant isolation in multi-workspace environments. ### Details The endpoint responsible for updating assistants: **PUT /api/v1/assistants/{assistantId}** accepts a JSON request body containing assistant metadata. However, the server does not restrict which properties may be modified by the client. As a result, user-controlled request bodies can include additional fields that should normally be controlled only by the backend. Server-controlled fields that can be manipulated include: 1. workspaceId 2. createdDate 3. updatedDate These fields appear to be directly mapped to the underlying database entity without strict DTO whitelisting or authorization checks. For example, the following request body was accepted: ```json { "details": "", "credential": "11ca7fef-c9b1-4c87-aa54-e547aed8a249", "iconSrc": null, "type": "CUSTOM", "createdDate": "2026-03-06T17:31:04.000Z", "updatedDate": "2026-03-06T17:31:55.000Z", "workspaceId": "11111111-2222-3333-4444-555555555555" } ``` This indicates that internal, server-controlled properties can be modified by an authenticated user. ### PoC 1. Authenticate to the Flowise interface. 2. Capture the request used to update an assistant: ```http PUT /api/v1/assistants/<ASSISTANT_ID> Content-Type: application/json Modify the request body by injecting server-controlled fields: { "details": "", "credential": "11ca7fef-c9b1-4c87-aa54-e547aed8a249", "iconSrc": null, "type": "CUSTOM", "createdDate": "2026-03-06T17:31:04.000Z", "updatedDate": "2026-03-06T17:31:55.000Z", "wor