CVE-2026-65597

n8n before 1.123.64 DOM-Based XSS via Unsandboxed iframe

State: Published
Severity: 8.2 High
Published: Jul 22, 2026
Updated: Oct 29, 2026
Reserved: Jul 22, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.2 High	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	VulnCheck

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
n8nn8n-io	before 1.123.64Affected 1.123.64Not affected
n8nn8n-io	2.30.0 to before 2.30.1Affected 2.30.1Not affected
n8nn8n-io	2.0.0-rc.0 to before 2.29.8Affected 2.29.8Not affected

References

GitHub Security Advisory (GHSA-p3rg-hrf9-w9gj)vendor-advisory
VulnCheck Advisory: n8n before 1.123.64 DOM-Based XSS via Unsandboxed iframethird-party-advisory

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