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EUVD-2026-325524

fkie_cve-2026-42862

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, a mass assignment vulnerability exists in the tool update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a tool resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign tools to arbitrary workspaces. This breaks tenant isolation in multi-workspace environments. This issue has been patched in version 3.1.2.

GHSA-x5v6-pj28-cwwm — FlowiseAI has Mass Assignment in Tool Update Endpoint that Allows Cross-Workspace Resource Reassignment

Affected: npm: flowise

### Summary A Mass Assignment vulnerability exists in the tool update endpoint of FlowiseAI.

The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a tool resource.

Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign tools to arbitrary workspaces. This breaks tenant isolation in multi-workspace environments.

### Details The endpoint responsible for updating tools:

**PUT /api/v1/tools/{toolId}**

accepts a JSON request body containing tool 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

The request body is directly merged into the underlying database entity without proper DTO validation or authorization checks.

### PoC Authenticate to the Flowise interface.

Capture the request used to update a tool:

```http PUT /api/v1/tools/<TOOL_ID> Content-Type: application/json

Modify the request body by injecting additional fields:

{ "name": "aaa", "description": "bbb", "color": "linear-gradient(rgb(109,215,45), rgb(136,170,134))", "schema": "[]", "func": "", "iconSrc": "test", "workspaceId": "11111111-2222-3333-4444-555555555…

WID-SEC-W-2026-1554 — Flowise: Mehrere Schwachstellen ermöglichen Codeausführung

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Flowise ausnutzen, um Code auszuführen, Objekte anderer Benutzer zu übernehmen, Informationen offenzulegen und weitere, nicht näher genannte Auswirkungen zu erzielen.