CVE-2026-73601

published 2026-08-13

CVE-2026-73601: Flowise versions before 3.1.3 contain a remote code execution vulnerability in the Custom MCP node when CUSTOM_MCP_PROTOCOL is set to stdio, allowing…

Priority P2 65 critical 9 CVSS 4.0

AV N AC L AT P 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

Flowise versions before 3.1.3 contain a remote code execution vulnerability in the Custom MCP node when CUSTOM_MCP_PROTOCOL is set to stdio, allowing authenticated users to execute arbitrary commands by manipulating environment variables and command arguments. Attackers can abuse PYTHONWARNINGS and BROWSER environment variables with python3, or leverage the root working directory with node to bypass validation and execute system commands.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
flowiseai	flowise	< 3.1.3	3.1.3

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CWE-95