---
id: CVE-2026-65597
aliases:
  - GHSA-p3rg-hrf9-w9gj
title: 'n8n: DOM-Based XSS via Unsandboxed iframe srcdoc in HTML Preview'
summary: 'n8n: DOM-Based XSS via Unsandboxed iframe srcdoc in HTML Preview'
severity: high
cwe:
  - CWE-79
vendor: n8n
product: n8n
ecosystem: npm
affected:
  - n8n < 1.123.64
  - 'n8n >= 2.30.0, < 2.30.1'
  - 'n8n >= 2.0.0-rc.0, < 2.29.8'
patched:
  - n8n 1.123.64
  - n8n 2.30.1
  - n8n 2.29.8
published: '2026-07-22'
updated: '2026-07-22'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-p3rg-hrf9-w9gj'
references:
  - url: 'https://github.com/n8n-io/n8n/security/advisories/GHSA-p3rg-hrf9-w9gj'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-65597'
  - url: 'https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.64'
  - url: 'https://github.com/n8n-io/n8n/releases/tag/n8n@2.29.8'
  - url: 'https://github.com/n8n-io/n8n/releases/tag/n8n@2.30.1'
  - url: >-
      https://www.vulncheck.com/advisories/n8n-before-dom-based-xss-via-unsandboxed-iframe
  - url: 'https://github.com/advisories/GHSA-p3rg-hrf9-w9gj'
tags:
  - ghsa
  - npm
ingestedAt: '2026-07-22T18:05:38.525Z'
epss: 0.00214
epssPercentile: 0.12019
---

## Overview

## Impact

The HTML preview renders execution output into an `iframe srcdoc` without `sandbox`, so a sanitizer bypass lets injected script run same-origin as the editor. When a victim opens the preview, it can call authenticated APIs with their session. An account with `global:member` privileges can exploit it.

## Patches

The issue has been fixed in n8n versions 1.123.64, 2.29.8, and 2.30.1. 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:
- Restrict n8n instance access to fully trusted users only.
- Set the `N8N_CONTENT_SECURITY_POLICY` environment variable to a policy that blocks inline scripts.
- Avoid exposing workflows that render externally-controlled input into the HTML node or binary HTML preview to untrusted users.

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

## Affected packages

- `n8n < 1.123.64`
- `n8n >= 2.30.0, < 2.30.1`
- `n8n >= 2.0.0-rc.0, < 2.29.8`

## Remediation

Upgrade to a patched release:

- `n8n 1.123.64`
- `n8n 2.30.1`
- `n8n 2.29.8`