/Vulnerability Library

Flowise < 3.1.2 - node-custom-function Unauthorized RCE

CVE-2026-46442
Verified

Description

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.

Severity

Critical

CVSS Score

9.9

Exploit Probability

3%

Affected Product

flowise

Published Date

July 20, 2026

Template Author

dhiyaneshdk, princechaddha

CVE-2026-46442.yaml
9.9Score

CVSS Metrics

CVSS Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVE ID:
cve-2026-46442
CWE ID:
cwe-78

References

https://nvd.nist.gov/vuln/detail/CVE-2026-46442https://github.com/FlowiseAI/Flowisehttps://github.com/FlowiseAI/Flowise/security/advisories

Remediation Steps

Update to version 3.1.2 or later.