CVE-2025-8943 – Flowise Custom MCPs Unauthenticated OS Command Execution

CVE ID : CVE-2025-8943

Published : Aug. 14, 2025, 10:15 a.m. | 19 minutes ago

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.

Severity: 9.8 | CRITICAL

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