AI agent vulnerability · n8n

CVE-2026-65597: n8n: DOM-Based XSS via Unsandboxed iframe srcdoc in HTML Preview

highCVSS 4.0 8.2GHSA-p3rg-hrf9-w9gj

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.

Published Jul 22, 2026

Affected packages

n8n

Ecosystem: npm
Affected: < 1.123.64
Fixed in: 1.123.64
Check: npm ls n8n

n8n

Ecosystem: npm
Affected: >= 2.30.0, < 2.30.1
Fixed in: 2.30.1
Check: npm ls n8n

n8n

Ecosystem: npm
Affected: >= 2.0.0-rc.0, < 2.29.8
Fixed in: 2.29.8
Check: npm ls n8n

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

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.

Credited to odgrso.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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