CVE-2026-56354: n8n - Cross-Site Scripting and Open Redirect in Form Node

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-10 · updated 2026-10-29
Weakness: CWE-79

Description

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.

Affected products

n8n-io n8n: before 1.123.24; from 2.0.0 before 2.10.4; from 2.10.0 before 2.10.4; from 2.11.0 before 2.12.0 — fixed in 1.123.24, 2.10.4, 2.12.0
n8n-io n8n: before 1.123.24; from 2.0.0-rc.0 before 2.10.4; from 2.11.0 before 2.12.0 — fixed in 1.123.24, 2.10.4, 2.12.0

How to fix

Upgrade to a fixed version: n8n-io n8n 1.123.24, 2.10.4, 2.12.0; n8n-io n8n 1.123.24, 2.10.4, 2.12.0. Check the vendor advisory for mitigations.

References

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