Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.0, a Mass Assignment vulnerability in the DocumentStore creation endpoint allows authenticated users to control the primary key (id) and internal state fields of DocumentStore entities. Because the service uses repository.save() with a client-supplied primary key, the POST create endpoint behaves as an implicit UPSERT operation. This enables overwriting existing DocumentStore objects. In multi-workspace or multi-tenant deployments, this can lead to cross-workspace object takeover and broken object-level authorization (IDOR), allowing an attacker to reassign or modify DocumentStore objects belonging to other workspaces. This vulnerability is fixed in 3.1.0.

Affected: npm: flowise

### Summary A Mass Assignment vulnerability in the DocumentStore creation endpoint allows authenticated users to control the primary key (id) and internal state fields of DocumentStore entities.

Because the service uses repository.save() with a client-supplied primary key, the POST create endpoint behaves as an implicit UPSERT operation. This enables overwriting existing DocumentStore objects.

In multi-workspace or multi-tenant deployments, this can lead to cross-workspace object takeover and broken object-level authorization (IDOR), allowing an attacker to reassign or modify DocumentStore objects belonging to other workspaces.

### Details The DocumentStore entity defines a globally unique primary key:

```typescript @PrimaryGeneratedColumn('uuid') id: string ```

The create logic is implemented as: ```typescript const documentStore = repo.create(newDocumentStore) const dbResponse = await repo.save(documentStore) ```

Here is no DTO allowlist or field filtering before persistence. The entire request body is mapped directly to the entity. TypeORM save() behavior:

1. If the primary key (id) exists → UPDATE 2. If not → INSERT

Because id is accepted from the client, the create endpoint effectively functions as an UPSERT endpoint.

This allows an authenticated user to submit:

```json { "id": "<existing_store_id>", "name": "modified", "description": "modified", "status": "SYNC", "embeddingConfig": "...", "vectorStoreConfig": "...", "recordManagerConfig": "..."…

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