CVE-2026-56356 PUBLISHED

n8n - Stored Cross-Site Scripting in Chat Trigger Node Custom CSS Field

Assigner: VulnCheck
Reserved: 20.06.2026 Published: 30.06.2026 Updated: 01.07.2026

n8n contains a stored cross-site scripting vulnerability in the Chat Trigger node's Custom CSS field due to a misconfiguration of the sanitize-html library. Affected releases are those before 1.123.27, the 2.0.0 through 2.13.2 line, and 2.14.0 (fixed in 1.123.27, 2.13.3, and 2.14.1). An authenticated user with permission to create or modify workflows can inject JavaScript that bypasses sanitization, resulting in stored XSS against any user who visits the public chat page.

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 1.123.27 (excl.) Version 1.123.27 is unaffected affected from 2.0.0-rc.0 to 2.13.3 (excl.) Version 2.13.3 is unaffected affected from 2.14.0 to 2.14.1 (excl.) Version 2.14.1 is unaffected

Vendor	n8n
Product	n8n
Versions	Default: unaffected affected from 0 to 2.14.1 (excl.) Version 2.14.1 is unaffected

Vendor	n8n
Product	n8n
Versions	Default: unaffected affected from 0 to 2.13.3 (excl.) Version 2.13.3 is unaffected

Credits

JorianWoltjer reporter

References

Problem Types

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