CVE-2026-65597 | n8n before 1.123.64, 2.x before 2.29.8, and before 2.30.1 co… | CVSS 8.2 HIGH

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.

Metadata

CVE ID: CVE-2026-65597
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-22 10:45 UTC
Published: 2026-07-22 11:21 UTC
Last updated: 2026-07-22 15:58 UTC
Primary CWE: CWE-79
Improper Neutralization of Input During Web Page Generation …
Vendor / Product: n8n-io / n8n
Sources: cve.org · NVD

Severity & Metrics

8.2 HIGH CVSS 4.0

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (3)

Vendor	Product	Platform	Versions
n8n-io	n8n	—	0 < 1.123.64, 1.123.64
n8n-io	n8n	—	0 < 2.30.1, 2.30.1
n8n-io	n8n	—	0 < 2.29.8, 2.29.8

Weakness (CWE)

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

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.2	HIGH	4.0	cna	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

References (2)

GitHub Security Advisory (GHSA-p3rg-hrf9-w9gj) https://github.com/n8n-io/n8n/security/advisories/GHSA-p3rg-hrf9-w9gj
VulnCheck Advisory: n8n before 1.123.64 DOM-Based XSS via Unsandboxed iframe https://www.vulncheck.com/advisories/n8n-before-dom-based-xss-via-unsandboxed-iframe