GitHub Advisoryadvisory · npm

GHSA-2vv2-3x8x-4gv7 Flowise OS command remote code execution

CRITICAL Published 2025-08-14 Modified 2025-08-18 Official page ↗
Aliases
CVE-2025-8943
Ecosystem
npm
Packages
flowise
Severity
Critical
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-306, CWE-78
Reviewed
2025-08-14

Affected packages

• npm flowise: <= 3.0.5 (no fix yet)

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.

Related

Alias · CVE (1)

  • CVE-2025-8943 The Custom MCPs feature is designed to execute OS commands, for instance, using tools like `npx` to spin up local MCP Servers. vulnerability

Weakness · CWE (2)

  • CWE-306 Missing Authentication for Critical Functionality weakness
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command weakness

References