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CVE-2025-71336

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 9.3 · Critical · EPSS 1.1% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • flowise

    Versions
    • ≥ 0, < 3.0.6: Affected (semver)
    • 3.0.6: Not affected (semver)

    Update to 3.0.6

  • flowise npm

    Affected ranges
    • SEMVER: ≥ 2.2.7-patch.1, < 3.0.6

    Update to 3.0.6

Original sources

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