n8n before versions 1.123.18 and 2.6.2 fails to verify HMAC-SHA256 signatures on Zendesk webhooks in the ZendeskTrigger node. Attackers who know the webhook URL can send unsigned POST requests to trigger workflows with arbitrary malicious data.
{
"cwe_ids": [
"CWE-290"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56360.json",
"cna_assigner": "VulnCheck"
}{
"cpe": "cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*",
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "1.123.18"
},
{
"introduced": "2.0.0"
},
{
"fixed": "2.6.2"
}
],
"source": "CPE_RANGE"
}