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EUVD-2026-292830

2026-10-04T08:17:42.828151+00:00

EUVD-2026-292830

fkie_cve-2026-41267

2026-10-04T08:17:42.828204+00:00

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.0, an improper mass assignment (JSON injection) vulnerability in the account registration endpoint of Flowise Cloud allows unauthenticated attackers to inject server-managed fields and nested objects during account creation. This enables client-controlled manipulation of ownership metadata, timestamps, organization association, and role mappings, breaking trust boundaries in a multi-tenant environment. This vulnerability is fixed in 3.1.0.

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

2026-10-04T08:17:42.828259+00:00

Affected: npm: flowise

### Summary

An improper mass assignment (JSON injection) vulnerability in the account registration endpoint of Flowise Cloud allows unauthenticated attackers to inject server-managed fields and nested objects during account creation. This enables client-controlled manipulation of ownership metadata, timestamps, organization association, and role mappings, breaking trust boundaries in a multi-tenant environment.

### Details

The POST /api/v1/account/register endpoint is intended to accept a minimal payload to create a new user account (e.g., name, email, password). However, the backend fails to enforce a strict allowlist or DTO-based validation and instead blindly maps client-supplied JSON to internal domain models.

As a result, attackers can include additional nested objects and server-managed fields in the request body such as organization, organizationUser, workspace, workspaceUser, and metadata fields like createdBy, updatedBy, createdDate, and updatedDate. These fields are persisted as provided by the client rather than being generated or validated server-side.

This behavior demonstrates a trust boundary violation where authorization and ownership decisions that must be enforced by the server are effectively delegated to untrusted client input. In a multi-tenant SaaS context, this can lead to unauthorized organization association and role assignment during registration.

### PoC Send a standard registration request:

```http POST /api/v1/account/register HTTP/2 Host:…

WID-SEC-W-2026-1145 — Flowise: Mehrere Schwachstellen

2026-10-04T08:17:42.828347+00:00

Ein Angreifer kann mehrere Schwachstellen in Flowise ausnutzen, um beliebigen Programmcode auszuführen, um Sicherheitsvorkehrungen zu umgehen, um Informationen offenzulegen, und um Dateien zu manipulieren.