CVE-2026-110847

Deferred Deferred - Pending Action

Stored XSS in n8n Workflow Chat Trigger

Publication date: 2026-10-14

Last updated on: 2026-10-15

Assigner: VulnCheck

Description

n8n before 1.123.83, 2.x before 2.41.4, and 2.42.x before 2.42.1 contains a stored cross-site scripting vulnerability in the Chat Trigger hosted-chat page, where insufficiently sanitised customCss values are interpolated into the page as markup. Workflow authors can publish a chat without n8n user authentication whose payload executes on the instance origin, acting on the sessions of signed-in visitors.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-14

Last Modified

2026-10-15

Generated

2026-10-19

AI Q&A

2026-10-15

EPSS Evaluated

2026-10-18

NVD

CVE-2026-110847

EUVD

EUVD-2026-101730

Affected Vendors & Products

Vendor	Product	Version / Range
n8n-io	n8n	0
n8n-io	n8n	2.0.0
n8n-io	n8n	2.42.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This is a stored cross-site scripting (XSS) vulnerability in n8n versions before 1.123.83, 2.x before 2.41.4, and 2.42.x before 2.42.1. It occurs in the Chat Trigger hosted-chat page where customCss values are not properly sanitized, allowing malicious code to be executed in the context of the n8n instance.

Detection Guidance

To detect this vulnerability, inspect n8n instances for unauthenticated chat triggers with customCss values containing executable scripts. Check workflows published without authentication for malicious payloads in the Chat Trigger hosted-chat page. No specific commands are provided in the context.

Impact Analysis

An attacker could exploit this to execute arbitrary JavaScript in the browser of signed-in users visiting the affected page. This could lead to session hijacking, data theft, or unauthorized actions performed on behalf of users.

Compliance Impact

This vulnerability allows execution of malicious scripts on the instance origin, potentially enabling unauthorized access to sensitive data processed by n8n workflows. This could lead to violations of GDPR (data protection) and HIPAA (healthcare data privacy) by exposing personal or protected health information during workflow execution.

Mitigation Strategies

Immediately update n8n to version 1.123.83, 2.41.4, or 2.42.1 or later. Disable unauthenticated chat trigger publishing if not required. Review and remove any suspicious workflows or customCss values in existing chat triggers.

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