CVE-2026-91931
Received Received - Intake

Remote Code Execution in Flowise AI Application

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: VulnCheck

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.

CVSS Scores

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-91931
EUVD
EUVD-2026-78789

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
flowise flowise-components to 3.1.4 (exc)
flowise flowise to 3.1.4 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Attack-Flow Graph

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Executive Summary

Flowise versions before 3.1.4 have a remote code execution flaw in the Custom MCP node. Authenticated attackers can exploit this by providing malicious npx package names in the mcpServerConfig parameter. This allows them to run arbitrary code on the Flowise server by leveraging attacker-controlled npm packages.

Detection Guidance

Check Flowise version with npm list -g flowise or flowise --version. Look for Custom MCP node configurations in the admin panel or database for suspicious npx package names in mcpServerConfig parameters.

Impact Analysis

This vulnerability allows attackers to execute arbitrary code on your Flowise server if they have authenticated access. This could lead to full system compromise, data theft, unauthorized modifications, or disruption of services. The high CVSS scores indicate significant risk of severe impact.

Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, violating GDPR and HIPAA requirements for data protection and access controls. Organizations using vulnerable Flowise versions may face compliance violations, legal penalties, and reputational damage if exploited.

Mitigation Strategies

Upgrade Flowise to version 3.1.4 or later immediately. Disable or restrict access to the Custom MCP node feature if not required. Review and remove any untrusted npx package configurations in mcpServerConfig.

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