CVE-2025-8943 — Unsupervised OS command execution leads to remote code execution by unauthenticated network attackers
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 aut…
Published: 2025-08-14 · CVSS: 9.8 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7