CVE-2026-56358 PUBLISHED

n8n - Stored Cross-Site Scripting in Form Trigger Node

Assigner: VulnCheck
Reserved: 20.06.2026 Published: 24.06.2026 Updated: 24.06.2026

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.

CVSS Vector: 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
CVSS Score: 5.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	Low
Attack Complexity	Low	Integrity	Low	Integrity	Low
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	Passive

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS Score: 5.4

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	Low
User Interaction	Required	Availability Impact	None

CVSS 3.1

Product Status

Vendor	n8n
Product	n8n
Versions	Default: unaffected affected from 0 to 1.123.25 (excl.) Version 1.123.25 is unaffected affected from 2.0.0-rc.0 to 2.11.2 (excl.) Version 2.11.2 is unaffected

Vendor	n8n
Product	n8n
Versions	Default: unaffected affected from 0 to 2.11.2 (excl.) Version 2.11.2 is unaffected

Vendor	n8n
Product	n8n
Versions	Default: unaffected affected from 0 to 1.123.25 (excl.) Version 1.123.25 is unaffected

Credits

tr4ce-ju reporter

References

Problem Types

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