n8n is an open source workflow automation platform. Prior to versions 1.123.33 and 2.17.5, the dynamic-node-parameters endpoints did not verify whether the authenticated caller was authorized to use a supplied credential reference. An authenticated user with access to a shared workflow could supply a foreign credential ID in the request body, causing the backend to decrypt and use that credential in a helper execution path where the caller also controls the destination URL. This allowed the caller to force the backend to authenticate against attacker-controlled infrastructure using a credential belonging to another user, effectively exfiltrating a reusable API key. The issue is not limited to any single node type; any node that resolves credentials dynamically through these endpoints may be affected. This issue has been patched in versions 1.123.33, 2.17.5, and 2.18.0.
{
"cwe_ids": [
"CWE-862"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42226.json",
"cna_assigner": "GitHub_M"
}{
"cpe": "cpe:2.3:a:n8n:n8n:*:*:*:*:enterprise:node.js:*:*",
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "1.123.33"
},
{
"introduced": "2.17.0"
},
{
"fixed": "2.17.5"
}
],
"source": "CPE_RANGE"
}