---
id: CVE-2026-54306
title: 'n8n: Prototype Pollution enables confused-deputy execution via public webhooks'
summary: 'n8n: Prototype Pollution enables confused-deputy execution via public webhooks'
severity: medium
cvss: 5.4
cwe:
  - CWE-1321
vendor: n8n
product: n8n
ecosystem: npm
affected:
  - 'n8n >= 2.26.0, < 2.26.2'
  - n8n < 2.25.7
patched:
  - n8n 2.26.2
  - n8n 2.25.7
published: '2026-06-16'
updated: '2026-06-16'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-2vff-hj5x-8gq7'
references:
  - url: 'https://github.com/n8n-io/n8n/security/advisories/GHSA-2vff-hj5x-8gq7'
  - url: 'https://github.com/advisories/GHSA-2vff-hj5x-8gq7'
tags:
  - ghsa
  - npm
epss: 0.0028
epssPercentile: 0.18155
ingestedAt: '2026-06-29T14:31:47.721Z'
---

## Overview

## Impact
A prototype pollution vulnerability allowed a crafted public webhook payload to inject attacker-controlled fields into workflow data during internal object copying. These fields could be surfaced and consumed as normal values by downstream built-in nodes.

Where a workflow combines a public webhook with action nodes that consume the resulting fields, an attacker could cause the workflow to act as a confused deputy — targeting unintended records or issuing outbound requests using the workflow owner's configured credentials.

## Patches
The issue has been fixed in n8n versions 2.25.7, and 2.26.2. Users should upgrade to one of these versions or later to remediate the vulnerability.

## Workarounds
If upgrading is not immediately possible, administrators should consider the following temporary mitigations:
- Avoid exposing public (unauthenticated) webhook workflows that pass incoming data through transform nodes into action nodes with sensitive credentials or database operations.
- Limit workflow creation and editing permissions to fully trusted users only.

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

## Affected packages

- `n8n >= 2.26.0, < 2.26.2`
- `n8n < 2.25.7`

## Remediation

Upgrade to a patched release:

- `n8n 2.26.2`
- `n8n 2.25.7`