Vulnerability Description
The Custom MCPs feature is designed to execute OS commands, for instance, using tools like `npx` to spin up local MCP Servers. However, Flowise's inherent authentication and authorization model is minimal and lacks role-based access controls (RBAC). Furthermore, in Flowise versions before 3.0.1 the default installation operates without authentication unless explicitly configured. This combination allows unauthenticated network attackers to execute unsandboxed OS commands.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Flowiseai | Flowise | < 3.0.1 |
Related Weaknesses (CWE)
References
- https://research.jfrog.com/vulnerabilities/flowise-os-command-remote-code-executExploitThird Party Advisory
FAQ
What is CVE-2025-8943?
CVE-2025-8943 is a vulnerability with a CVSS score of 9.8 (CRITICAL). The Custom MCPs feature is designed to execute OS commands, for instance, using tools like `npx` to spin up local MCP Servers. However, Flowise's inherent authentication and authorization model is min...
How severe is CVE-2025-8943?
CVE-2025-8943 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-2025-8943?
Check the references section above for vendor advisories and patch information. Affected products include: Flowiseai Flowise.