Flowise
CVE-2025-8943
CRITICAL
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Flowise versions before 3.0.1 allow unauthenticated access to the Custom MCPs feature, which is designed to execute OS commands. The combination of no default authentication and the ability to spawn local processes via tools like npx enables unauthenticated remote code execution on any Flowise installation.
Technical ContextAI
Flowise's Custom MCPs feature allows configuring external MCP (Model Context Protocol) servers using commands like npx. This feature is inherently capable of executing OS commands. Prior to version 3.0.1, Flowise operates without authentication by default and lacks RBAC. Any unauthenticated user can create Custom MCP configurations that execute arbitrary commands on the server.
RemediationAI
Update to Flowise 3.0.1 or later. Enable authentication immediately on all Flowise instances. Run Flowise behind a reverse proxy with authentication. Deploy in containers with restricted network and filesystem access. Never expose Flowise directly to the internet.
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Same technique Authentication Bypass
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External POC / Exploit Code
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