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.
{
"cna_assigner": "VulnCheck",
"cwe_ids": [
"CWE-79"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110847.json"
}{
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "1.123.83"
},
{
"introduced": "2.0.0"
},
{
"fixed": "2.41.4"
},
{
"introduced": "2.42.0"
},
{
"fixed": "2.42.1"
}
],
"source": "AFFECTED_FIELD"
}