Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Flowiseai | Flowise | < 3.1.3 |
Related Weaknesses (CWE)
References
- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-g98q-rm45-q9h8Vendor Advisory
- https://www.vulncheck.com/advisories/flowise-before-remote-code-execution-via-cuThird Party Advisory
FAQ
What is CVE-2026-73601?
CVE-2026-73601 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 ...
How severe is CVE-2026-73601?
CVE-2026-73601 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-73601?
Check the references section above for vendor advisories and patch information. Affected products include: Flowiseai Flowise.