---
id: CVE-2026-54312
title: 'n8n: Microsoft SQL Node Prototype Pollution'
summary: 'n8n: Microsoft SQL Node Prototype Pollution'
severity: high
cvss: 8.5
cwe:
  - CWE-1321
vendor: n8n
product: n8n
ecosystem: npm
affected:
  - n8n < 2.24.0
patched:
  - n8n 2.24.0
published: '2026-06-16'
updated: '2026-06-16'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-x6p3-m6h9-fx7r'
references:
  - url: 'https://github.com/n8n-io/n8n/security/advisories/GHSA-x6p3-m6h9-fx7r'
  - url: 'https://github.com/advisories/GHSA-x6p3-m6h9-fx7r'
tags:
  - ghsa
  - npm
epss: 0.00396
epssPercentile: 0.31036
ingestedAt: '2026-06-29T14:31:47.478Z'
---

## Overview

## Impact
An authenticated user with permission to create or modify workflows could achieve global prototype pollution via the Microsoft SQL node by supplying a crafted value as the table parameter. This pollutes `Object.prototype` process-wide for the lifetime of the n8n server process, causing application-wide validation failures and rendering the n8n instance completely non-functional until restarted.

## Patches
The issue has been fixed in n8n version 2.24.0. Users should upgrade to this version or later to remediate the vulnerability.

## Workarounds
If upgrading is not immediately possible, administrators should consider the following temporary mitigations:
- Limit workflow creation and editing permissions to fully trusted users only.
- Disable the Microsoft SQL node by adding `n8n-nodes-base.microsoftSql` to the `NODES_EXCLUDE` environment variable.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

## Affected packages

- `n8n < 2.24.0`

## Remediation

Upgrade to a patched release:

- `n8n 2.24.0`