CVE-2026-73601

UNKNOWN 0.0

Flowise before 3.1.3 Remote Code Execution via Custom MCP

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-95
Vendor	flowiseai
Product	flowise
Published	Aug 13, 2026

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Affected Versions

FlowiseAI / Flowise

0 < 3.1.3

FlowiseAI / Flowise

0 < 3.1.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-g98q-rm45-q9h8 vulncheck.com: https://www.vulncheck.com/advisories/flowise-before-remote-code-execution-via-custom-mcp

Credits

🔍 alex-elttam