CVE-2025-8943 CRITICAL

CVE-2025-8943: Unsupervised OS command execution leads to remote code execution by unauthenticated network attackers

Published August 14, 2025
Last update August 18, 2025
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CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

August 14, 2025 CVE published
August 18, 2025 Record updated