n8n versions before 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1 fail to verify the x-webflow-signature HMAC in the Webflow Trigger node webhook handler. Unauthenticated attackers can send forged webhook requests with attacker-controlled payloads to trigger workflows and manipulate downstream actions like record creation or API calls.
{
"cna_assigner": "VulnCheck",
"cwe_ids": [
"CWE-347"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103245.json"
}{
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "1.123.80"
},
{
"introduced": "2.0.0"
},
{
"fixed": "2.39.6"
},
{
"introduced": "2.40.0"
},
{
"fixed": "2.40.1"
}
],
"source": "AFFECTED_FIELD"
}