Flowise < 3.1.2 - node-custom-function Unauthorized RCE
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. References: https://nvd.nist.gov/vuln/detail/CVE-2026-46442 https://github.com/FlowiseAI/Flowise https://github.com/FlowiseAI/Flowise/security/advisories Remediation: Update to version 3.1.2 or later.
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