n8n before 1.123.15 and 2.5.0 contains a webhook forgery vulnerability in the GitHub Webhook Trigger node that fails to implement HMAC-SHA256 signature verification. Attackers who know the webhook URL can send unsigned POST requests to trigger workflows with arbitrary data, spoofing GitHub webhook events.
{
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56357.json",
"cna_assigner": "VulnCheck",
"cwe_ids": [
"CWE-290"
]
}{
"source": "CPE_RANGE",
"cpe": [
"cpe:2.3:a:n8n:n8n:*:*:*:*:community:node.js:*:*",
"cpe:2.3:a:n8n:n8n:*:*:*:*:enterprise:node.js:*:*"
],
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "1.123.15"
},
{
"introduced": "2.0.0"
},
{
"fixed": "2.5.0"
}
]
}