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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | flowise | < 3.0.1 | 3.0.1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Metasploit 1 module
-
Flowise Custom MCP Remote Code Execution
exploit/multi/http/flowise_custommcp_rce
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- Flowise < 3.0.1 - Remote Command Execution http/cves/2025/CVE-2025-8943.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | flowise | <= 3.0.5 | — | GHSA-2vv2-3x8x-4gv7 |
Advisories 1
- WID-SEC-2025-1836 Flowise: Mehrere Schwachstellen ermöglichen Codeausführung BSI CERT-Bund (WID) · Aug 14, 2025