CVE-2026-73601

Flowise before 3.1.3 Remote Code Execution via Custom MCP

State: Published
Severity: 9.0 Critical
Published: Aug 13, 2026
Updated: Aug 14, 2026
Reserved: Aug 13, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	9.0 Critical	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	VulnCheck

Weaknesses

CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')

Affected Products

Product	Versions
FlowiseFlowiseAI	before 3.1.3Affected 3.1.3Not affected
FlowiseFlowiseAI	before 3.1.3Affected 3.1.3Not affected

References

GitHub Security Advisory (GHSA-g98q-rm45-q9h8)vendor-advisory
VulnCheck Advisory: Flowise before 3.1.3 Remote Code Execution via Custom MCPthird-party-advisory

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