CVE-2026-73601

High

Description

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.

SeverityHigh

CVSS8.8

Exploit probability—

ProductFlowise

PublishedAug 13, 2026

First seenAug 13, 2026

Weakness typeCWE-95CWE-95

How to fix

Update

flowiseai flowise3.1.3 or later

Vendor advisories

github.com/FlowiseAI/Flowise/security/advisories/GHSA-g98q-rm45-q9h8

Affected products

Product	Affected versions	Fixed in
flowiseai flowise	v < 3.1.3	3.1.3

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