CVE-2026-110847 n8n - Stored XSS

n8n < 1.123.83, 2.x < 2.41.4, and 2.42.x < 2.42.1 contain a stored cross-site scripting caused by insufficient sanitization of customCss values in the Chat Trigger hosted-chat page, letting workflow authors publish malicious chat payloads executing on signed-in visitors' sessions, exploit requires published chat without user authentication.

CVSS base score 7.0 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Stored XSS
Impact
Stored XSS
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
14 October 2026
Updated
15 October 2026
Weakness
CWE-79

Vendor fix

Update to versions 1.123.83, 2.41.4, 2.42.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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