CVE-2026-110847
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.
- Score
- CVSS 4.0 7.0 High
- Status
- Deferred - disclosure@vulncheck.com
- Published
- 2026-10-14
- Last modified
- 2026-10-15
- Weaknesses
- CWE-79
Affected products
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-x5cw-hm7v-q7mj
- https://www.vulncheck.com/advisories/n8n-before-1.123.83-2.41.4-and-2.42.1-stored-xss-via-chat-trigger-customcss-parame…
