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CVE-2026-46442

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

Published: Jun 8, 2026Updated: Jun 11, 2026 Sources: CVE List NVDCWE-94
NVD MITRE
9.9CVSSCRITICAL
EPSS Score
0.6%
Top 53.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-94

Affected Products

flowiseflowiseai
On-premWeb App
AI / ML / ai-agent-tooling
FlowiseFlowiseAI
On-premWeb App
AI / ML / ai-agent-tooling
flowiseaioss-projectAI / MLaka flowise, flowise-components, embed

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Workaround Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

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

Timeline

Published
Jun 8, 2026
Last Updated
Jun 11, 2026

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