n8n versions before 1.123.64, 2.29.8, and 2.30.1 contain a privilege escalation vulnerability in Enterprise SSO instance-role provisioning. The provisioning path maps an IdP-asserted role claim to an n8n global role but does not prevent assignment of the global:owner role (unlike the token-exchange identity path, which rejects it). An SSO-authenticated user whose instance-role claim resolves to global:owner is provisioned as instance owner, gaining full administrative control over workflows, credentials, users, and instance configuration. Exploitation requires that Enterprise SSO is configured, instance-role provisioning is enabled via N8NSSOSCOPESPROVISIONINSTANCE_ROLE (disabled by default), and the attacker controls the instance-role claim value issued by the IdP.
{
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65016.json",
"cna_assigner": "VulnCheck",
"cwe_ids": [
"CWE-639"
]
}{
"source": "AFFECTED_FIELD",
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "1.123.64"
},
{
"fixed": "2.30.1"
},
{
"fixed": "2.29.8"
}
]
}