CVE-2026-73601

unknowncovered by 1 sourcefirst seen 2026-08-13

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.

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Exploitation outlook

Low exploitation risk0.61% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 46% of all EPSS-scored CVEs.

Advisory coverage (1)

unknownCVE-2026-73601: Flowise versions before 3.1.3 contain a remote code execution vulnerability in the Custom MCP …nvd · 2026-08-13

External references

NVD record for CVE-2026-73601

CVE.org record

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