What’s Vulnerable › Vulnerabilities

CVE-2026-46442: Flowise: Authenticated Host RCE via POST /api/v1/node-custom-function and NodeVM Sandbox Escape

• Severity: critical (CVSS 9.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 36.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-08 · updated 2026-07-23
• Weakness: CWE-94

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.

Affected products

• FlowiseAI Flowise: before 3.1.2 — fixed in 3.1.2

How to fix

Upgrade to a fixed version: FlowiseAI Flowise 3.1.2. Check the vendor advisory for mitigations.

References

• https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2
• https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-9rvc-vf7m-pgm2
• https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-9rvc-vf7m-pgm2

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