---
title: "CVE-2026-91931: Flowise - Remote Code Execution"
description: "Flowise < 3.1.4 contains a remote code execution caused by improper validation of npx package names in the Custom MCP node's mcpServerConfig parameter, letting authenticated attackers execute arbitrary code on the server."
url: https://panop.io/threat-heartbeat/CVE-2026-91931/
---

# CVE-2026-91931 Flowise - Remote Code Execution

Flowise < 3.1.4 contains a remote code execution caused by improper validation of npx package names in the Custom MCP node's mcpServerConfig parameter, letting authenticated attackers execute arbitrary code on the server.

CVSS base score 8.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.68% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-91931)

## Details

Type

Remote Code Execution

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Published

15 September 2026

Updated

15 October 2026

Weakness

[CWE-78](https://cwe.mitre.org/data/definitions/78.html)

## Vendor fix

Upgrade to version 3.1.4 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-91931](https://nvd.nist.gov/vuln/detail/CVE-2026-91931)
- [https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-vcwp-f9rq-3887](https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-vcwp-f9rq-3887)
- [https://www.vulncheck.com/advisories/flowise-before-3.1.4-remote-code-execution-via-custom-mcp-npx](https://www.vulncheck.com/advisories/flowise-before-3.1.4-remote-code-execution-via-custom-mcp-npx)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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