CVE-2026-56358

n8n - Stored Cross-Site Scripting in Form Trigger Node

State: Published
Severity: 5.1 Medium
Published: Jun 24, 2026
Updated: Oct 29, 2026
Reserved: Jun 20, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N	VulnCheck
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N	VulnCheck

Weaknesses

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

Affected Products

Product	Versions
n8nn8n	before 1.123.25Affected 1.123.25Not affected 2.0.0-rc.0 to before 2.11.2Affected 2.11.2Not affected
n8nn8n	2.0.0-rc.0 to before 2.11.2Affected 2.11.2Not affected
n8nn8n	before 1.123.25Affected 1.123.25Not affected

References

GitHub Security Advisory (GHSA-q4fm-pjq6-m63g)vendor-advisory
VulnCheck Advisory: n8n - Stored Cross-Site Scripting in Form Trigger Nodethird-party-advisory

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