Critical severityNVD Advisory· Published Aug 13, 2026

CVE-2026-73601

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Flowiseai/Flowisellm-fuzzy
Range: <3.1.3

Patches

Vulnerability mechanics

References

github.com/FlowiseAI/Flowise/security/advisories/GHSA-g98q-rm45-q9h8nvd
www.vulncheck.com/advisories/flowise-before-remote-code-execution-via-custom-mcpnvd

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