XSS in N8n-Io N8n
CVE-2026-103249
n8n versions before 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1 contain a stored DOM cross-site scripting vulnerability in Resource Locator parameter dropdown link handling. Workflow authors can inject malicious script URLs that execute arbitrary JavaScript in the editor origin when other users open the node dropdown and click the external-link icon, with the payload persisting across workflow imports and shares.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/n8n-io/n8n/security/advisories/GHSA-c2wp-6fgc-xjq4 (vendor-advisory)
- www.vulncheck.com/advisories/n8n-before-1.123.80-2.39.6-and-2.40.1-stored-dom-x… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-103249?
- CVE-2026-103249 is a high-severity vulnerability in N8n-Io N8n, classified under Cross-site Scripting. CVSS score: 7.6/10. Published 2026-10-01.
- How severe is CVE-2026-103249?
- High severity. CVSS v3 base score is 7.6 out of 10.