CVE-2025-71336 Flowise - Unsandboxed Remote Code Execution via Custom MCP
Attackers can execute arbitrary OS commands via the Custom MCP feature due to missing authentication and input validation, leading to full system compromise.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-71336?
CVE-2025-71336 is a critical command injection vulnerability in Flowiseai Flowise, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Flowise before 3.0.6 (affected versions 2.2.7-patch.1 and earlier) contains an unsandboxed remote code execution vulnerability in the Custom MCP feature, which is designed to execute OS commands such as launching local MCP servers. Because Flowise's authentication and authorization model is minimal and lacks role-based access control, and the default installation runs without authentication unless FLOWISE_USERNAME and FLOWISE_PASSWORD are set, an attacker can send a crafted JSON payload with the header 'x-request-from: internal' to the /api/v1/node-load-method/customMCP endpoint to execute arbitrary OS commands, resulting in complete compromise of the platform container or server.
Weakness: CWE-78
Which versions are affected by CVE-2025-71336?
2 open source packages ship an affected version, including flowise. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
flowise npm | From 2.2.7-patch.1 | 3.0.6 |
flowise npm | From 2.2.7-patch.1 | 3.0.6 |
Products include Flowiseai Flowise.
How do I fix CVE-2025-71336?
Upgrade flowise to 3.0.6 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2025-71336 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-71336 exists.
Other vulnerabilities in Flowiseai Flowise
- CVE-2025-71338 Flowise through 2.2.7 - Arbitrary File Write to Remote Code Execution via document-store API
- CVE-2026-40933 Flowise: Authenticated RCE Via MCP Adapters
- CVE-2025-61913 Flowise is vulnerable to arbitrary file read, arbitrary file write
- CVE-2025-59528 Flowise has Remote Code Execution vulnerability
- CVE-2026-52098 Code injection in n/a
Sources
Also known as GHSA-6933-jpx5-q87q, GHSA-q2xp-j85q-883h.