Description
Flowise before 3.1.2 contains multiple OS command injection vulnerabilities in the Custom MCP Server feature due to incomplete command-flag validation and a regex bypass in local file access restrictions. An attacker with a Flowise account of any role, or API access with view/update permissions for chatflows, can configure a malicious MCP server to bypass the validateCommandFlags blocklist (for example, 'docker build' is not blocked, and 'npx --yes' is not blocked while only '-y' is) and the validateArgsForLocalFileAccess checks, resulting in execution of arbitrary commands on the Flowise host.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Flowise | Flowise | < 3.1.2 | 3.1.2 |
| Flowise | Flowise Components | < 3.1.2 | 3.1.2 |
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 MCP Server Remote Code Execution
exploit/multi/http/flowise_mcp_rce
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | flowise | < 3.1.2 | 3.1.2 | GHSA-m99r-2hxc-cp3q |
| npm | flowise-components | < 3.1.2 | 3.1.2 | GHSA-m99r-2hxc-cp3q |
Advisories 1
- WID-SEC-2026-1554 Flowise: Mehrere Schwachstellen ermöglichen Codeausführung BSI CERT-Bund (WID) · Jun 30, 2026