XSS in N8n
CVE-2026-56354
n8n before 1.123.24, 2.10.4, and 2.12.0 (across its 1.x and 2.x branches) contains cross-site scripting and open redirect vulnerabilities in the Form Node due to unsanitized HTML description fields and overly permissive iframe sandbox policies. Authenticated users with workflow creation permissions can inject malicious scripts or redirect parameters to perform stored XSS attacks or phishing redirects against end users.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (13.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 13.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- N8n — versions 0, 1.123.24, 2.0.0-rc.0
Weakness classification (CWE)
References
- github.com/n8n-io/n8n/security/advisories/GHSA-w673-8fjw-457c (vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/n8n-cross-site-scripting-and-open-redirect-in-form… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-56354?
- CVE-2026-56354 is a medium-severity vulnerability in N8n, classified under Cross-site Scripting. CVSS score: 4.1/10. Published 2026-07-10.
- How severe is CVE-2026-56354?
- Medium severity. CVSS v3 base score is 4.1 out of 10.