CVE-2026-46442
Flowise: Authenticated Host RCE via POST /api/v1/node-custom-function and NodeVM Sandbox Escape
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
- FlowiseAI · Flowise
- CVSS v4.0 GITHUB
- 9.4 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS v4.0 GitHub
- 9.4 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H - CVSS v3.1 NVD
- 9.9 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - EPSS
- 3.41% chance of exploitation in the next 30 days, 89th percentile
- Nuclei
- critical · CWE-78
- Published
- 2026-06-08
- Updated
- 2026-06-09
Proof-of-concept exploits (2)
- advisories/GHSA-9rvc-vf7m-pgm2
- codeb0ssx/CVE-2026-46442-PoC0★ · 2026-07-17
Nuclei templates (1)
Security advisories
- FlowiseAI/Flowise/security/advisories/GHSA-9rvc-vf7m-pgm2
- FlowiseAI/Flowise/releases/tag/flowise%403.1.2