CVE-2026-110847: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in n8n-io n8n
Description
CVE-2026-110847 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. The flaw exists in the Chat Trigger hosted-chat page where customCss values are not properly sanitized and are injected as markup. This allows workflow authors to publish chats without user authentication, potentially executing malicious payloads in the context of signed-in users' sessions.
CVSS v4.0
Score 7.0high
Affected software
n8n-io
n8n
pkg:npm/n8n-io/n8nRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in n8n involves improper neutralization of input during web page generation, specifically in the Chat Trigger hosted-chat page. Unsanitized customCss values are interpolated directly into the page markup, enabling stored cross-site scripting attacks. This can be exploited by workflow authors who can publish chats without requiring n8n user authentication, causing malicious scripts to execute on the instance origin and act on sessions of signed-in visitors.
Potential Impact
An attacker can execute arbitrary scripts in the context of authenticated users' sessions on the affected n8n instance. This can lead to session hijacking or unauthorized actions performed on behalf of signed-in users. The vulnerability is rated with a CVSS 4.0 score of 7 (high severity), indicating significant risk if exploited.
Mitigation Recommendations
A fix is available in n8n versions 1.123.83, 2.41.4, and 2.42.1 and later. Users should upgrade to these versions or later to remediate the vulnerability. There is no indication that this vulnerability is mitigated by configuration or other means; patching is the recommended action.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-14T22:12:22.055Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad00a612cdf04f656ba0261
Added to database: 10/14/2026, 23:04:01 UTC
Last enriched: 10/14/2026, 23:19:29 UTC
Last updated: 10/14/2026, 23:28:18 UTC
Views: 5
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