Open-Source Security Intelligence

Know every vulnerability
before it knows you.

DevGuard continuously monitors your dependencies and alerts you when CVEs like this one affect your stack — with real-time threat intelligence built for developers.

Checkout DevGuardView on GitHub
Search

GHSA-x5v6-pj28-cwwm

HighCVSS 7.6 / 10
Published May 14, 2026·Last modified May 14, 2026
Affected Components(0)

No affected components available

Description

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:

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": "11111111-2222-3333-4444-555555555555",
  "createdDate": "1995-03-06T14:17:50.000Z",
  "updatedDate": "1995-03-06T14:17:50.000Z"
}

Send the request.

Observe that the response includes the manipulated fields:

{
  "workspaceId": "11111111-2222-3333-4444-555555555555",
  "createdDate": "1995-03-06T14:17:50.000Z"
}

This confirms that client-controlled values are accepted and persisted by the server.

Impact

This vulnerability allows authenticated users to manipulate internal attributes of tool resources.

Confirmed impacts include:

  • Cross-workspace reassignment of tools (workspaceId)
  • Unauthorized modification of metadata (createdDate, updatedDate)

In multi-tenant deployments, this may allow an attacker to move tools between workspaces without authorization, breaking tenant isolation boundaries.

Risk Scores
Base Score
7.6

The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
4.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.19%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities

Browse More

High severity
Scan your project

Continuously monitor your dependencies and get alerted when vulnerabilities like this one affect your stack.

Checkout DevGuard