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.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-6933-jpx5-q87q Exploit, Mitigation, Vendor Advisory
- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-6933-jpx5-q87q Exploit, Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 9.3 · flowiseaiNVD modified 2026-10-12 21:10
Affected (CPE criteria) 1
cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*
References 3
- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-6933-jpx5-q87q Exploit, Mitigation, Vendor Advisory
- https://www.vulncheck.com/advisories/flowise-unsandboxed-remote-code-execution-via-custom-mcp Third Party Advisory
- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-6933-jpx5-q87q Exploit, Mitigation, Vendor Advisory