CVE-2026-46442
CriticalCVSS 9.9Exploitation Probability (EPSS)
High risk86th percentile - higher than 86% of all known CVEs
Summary
A vulnerability in Flowise prior to version 3.1.2 allows an authenticated attacker to achieve remote code execution by submitting arbitrary JavaScript to the Custom JS Function node. Missing authorization on the POST /api/v1/node-custom-function endpoint.
Risk Assessment
Risk of remote code execution on the Flowise server, potentially leading to host compromise, data theft, and further attacks.
Recommendation
Update Flowise to version 3.1.2 or later, which includes the fix.
Original NVD description (English source)
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.