CVE-2026-56358: n8n

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

n8n before 1.123.25 (1.x) and before 2.11.2 (2.x), with the fix also included in 2.12.0, contains a stored cross-site scripting vulnerability in the Form Trigger node's CSS sanitization that allows authenticated users to inject malicious scripts. Attackers with workflow creation permissions can inject XSS payloads that execute persistently for all form visitors, enabling form hijacking and phishing attacks.

Affected products

• n8n n8n: before 1.123.25 (fixed in 1.123.25); from 2.0.0, before 2.11.2 (fixed in 2.11.2)

Published 2026-06-24. Last modified 2026-06-26.