---
id: CVE-2026-110842
title: >-
  n8n before 2.41.4 and 2.42.x before 2.42.1 contains a prototype pollution
  vulnerability in the MCP workflow-validation tool, whose interpreter evaluates
  caller-supplied code in the main process, reads inherited properties, and
  permits as…
summary: >-
  n8n before 2.41.4 and 2.42.x before 2.42.1 contains a prototype pollution
  vulnerability in the MCP workflow-validation tool, whose interpreter evaluates
  caller-supplied code in the main process, reads inherited properties, and
  permits as…
severity: none
cwe:
  - CWE-1321
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T23:17:24.743'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110842'
references:
  - url: 'https://github.com/n8n-io/n8n/security/advisories/GHSA-5jr4-xmvf-frmj'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/n8n-before-2.41.4-and-2.42.1-prototype-pollution-via-mcp-workflow-validation-interpreter
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-15T00:02:07.175Z'
---

## Overview

n8n before 2.41.4 and 2.42.x before 2.42.1 contains a prototype pollution vulnerability in the MCP workflow-validation tool, whose interpreter evaluates caller-supplied code in the main process, reads inherited properties, and permits assignment onto shared prototypes. An authenticated member holding only a workflow:read grant can replace a built-in method with one returning a truthy value so server-side permission checks accept unheld scopes, enabling takeover of owner accounts not protected by MFA.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.