CVE-2026-46442: Flowiseai Flowise

Critical severity, CVSS 9.9. EPSS: 3.4% chance of exploitation in the next 30 days.

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.

Affected products

• Flowiseai Flowise: before 3.1.2 (fixed in 3.1.2)

Published 2026-06-08. Last modified 2026-07-23.