High severity8.5NVD Advisory· Published Sep 15, 2026

CVE-2026-91931

Description

Flowise before 3.1.4 contains a remote code execution vulnerability in the Custom MCP node that allows authenticated attackers to execute arbitrary code by supplying npx package names in the mcpServerConfig parameter. Attackers can invoke npx with attacker-controlled npm packages to execute code on the Flowise server.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Flowiseai/Flowisellm-fuzzy
Range: <3.1.4

Patches

Vulnerability mechanics

References

github.com/FlowiseAI/Flowise/security/advisories/GHSA-vcwp-f9rq-3887nvd
www.vulncheck.com/advisories/flowise-before-3.1.4-remote-code-execution-via-custom-mcp-npxnvd

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