CRITICAL 9.0 NVD
CVE-2026-73601
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 authentica
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.
References
- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-g98q-rm45-q9h8
- https://www.vulncheck.com/advisories/flowise-before-remote-code-execution-via-custom-mcp
This critical severity vulnerability with a CVSS score of 9.0 was published on 2026-08-13 via NVD.
Risk Timeline
CVE Disclosed2026-08-13 · -1 days ago
Remediation Resources
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