n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain a credentials leak vulnerability in the Wekan and Baserow username-and-password credentials that sends unencrypted passwords to unvalidated hosts. Attackers with credential update permissions can modify the host field to receive account passwords at arbitrary hosts, bypassing domain validation controls.
{
"cna_assigner": "VulnCheck",
"cwe_ids": [
"CWE-522"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103256.json"
}{
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "2.39.6"
},
{
"introduced": "2.40.0"
},
{
"fixed": "2.40.1"
}
],
"source": "AFFECTED_FIELD"
}