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EUVD-2026-325846

fkie_cve-2026-46442

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, POST /api/v1/node-custom-function lacks route-level authorization, allowing any authenticated user or API key to submit arbitrary JavaScript to the Custom JS Function node. When E2B_APIKEY is not configured — the common deployment case — Flowise executes this code inside a NodeVM sandbox. This sandbox can be escaped, allowing an attacker to reach the host process object and execute system commands via child_process. The result is authenticated remote code execution on the Flowise server host. This issue has been patched in version 3.1.2.

GHSA-9rvc-vf7m-pgm2 — FlowiseAI: Authenticated Host RCE via POST /api/v1/node-custom-function and NodeVM Sandbox Escape

Affected: npm: flowise

### Summary

`POST /api/v1/node-custom-function` lacks route-level authorization, allowing any authenticated user or API key to submit arbitrary JavaScript to the `Custom JS Function` node.

When `E2B_APIKEY` is not configured — the common deployment case — Flowise executes this code inside a `NodeVM` sandbox. This sandbox can be escaped, allowing an attacker to reach the host `process` object and execute system commands via `child_process`.

The result is authenticated remote code execution on the Flowise server host. CVSS v3.1: `AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H` = **9.9 Critical**.

### Details

Two distinct security boundaries are violated.

**1. Missing route-level authorization**

`packages/server/src/routes/node-custom-functions/index.ts` registers the endpoint with no permission middleware:

```ts router.post('/', nodesRouter.executeCustomFunction) ```

Other sensitive routes in the same codebase use explicit permission gates:

```ts // packages/server/src/routes/chatflows/index.ts router.post( '/', checkAnyPermission('chatflows:create,chatflows:update,agentflows:create,agentflows:update'), chatflowsController.saveChatflow ) ```

Global `/api/v1` authentication still applies, so this is not unauthenticated — but any valid session or API key reaches the endpoint without further restriction.

**2. NodeVM sandbox escape**

The endpoint forwards `body.javascriptFunction` through the following chain:

``` POST /api/v1/node-custom-function → packages/server/src/c…

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.