Improper access control in Flowise - CVE-2026-46442
Published: May 18, 2026
Vulnerability identifier: #VU131702
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-46442
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: FlowiseAI
Affected software:
Flowise
Flowise
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary code on the host system.
The vulnerability exists due to improper access control in POST /api/v1/node-custom-function when handling authenticated requests that submit user-supplied JavaScript to the Custom JS Function node. A remote user can send a specially crafted request to execute arbitrary code on the host system.
Exploitation requires the NodeVM fallback path to be used, which occurs when E2B_APIKEY is not configured.
How to mitigate CVE-2026-46442
Install security update from vendor's website.