CVE-2026-46442Public exploitNetwork attack vector

Authenticated host RCE via NodeVM sandbox escape

Published Jun 8, 2026 · Updated Jun 8, 2026

Code injection in Flowise before 3.1.2 allows remote authenticated users to execute system commands through a custom-function API. POST /api/v1/node-custom-function accepts arbitrary JavaScript without route-level permission checks, and the NodeVM fallback lets a host Error expose the outer Function constructor, process, and child_process. A valid session or API key and an unset E2B_APIKEY are required; successful exploitation runs commands with the Flowise server process privileges.

CVSS severity9.4
Critical
EPSS probability36.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Flowise before 3.1.2 allows remote authenticated users to execute system commands through a custom-function API. POST /api/v1/node-custom-function accepts arbitrary JavaScript without route-level permission checks, and the NodeVM fallback lets a host Error expose the outer Function constructor, process, and child_process. A valid session or API key and an unset E2B_APIKEY are required; successful exploitation runs commands with the Flowise server process privileges.

The record

CVE
CVE-2026-46442
Published
Jun 8, 2026
Updated
Jun 8, 2026
Vendor
FlowiseAI
Product
Flowise
Classifications
CWE-94, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FlowiseAI · Flowiseversion=< 3.1.2

Published CVSS scores

9.9GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
9.4GitHub, Inc.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 describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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