Vulnerability Description
Flowise before 3.0.6 (affected versions 2.2.7-patch.1 and earlier) contains an unsandboxed remote code execution vulnerability in the Custom MCP feature, which is designed to execute OS commands such as launching local MCP servers. Because Flowise's authentication and authorization model is minimal and lacks role-based access control, and the default installation runs without authentication unless FLOWISE_USERNAME and FLOWISE_PASSWORD are set, an attacker can send a crafted JSON payload with the header 'x-request-from: internal' to the /api/v1/node-load-method/customMCP endpoint to execute arbitrary OS commands, resulting in complete compromise of the platform container or server.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-6933-jpx5-q87q
- https://www.vulncheck.com/advisories/flowise-unsandboxed-remote-code-execution-v
FAQ
What is CVE-2025-71336?
CVE-2025-71336 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Flowise before 3.0.6 (affected versions 2.2.7-patch.1 and earlier) contains an unsandboxed remote code execution vulnerability in the Custom MCP feature, which is designed to execute OS commands such ...
How severe is CVE-2025-71336?
CVE-2025-71336 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2025-71336?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.