CVE-2026-56348: n8n

Critical severity, CVSS 9.9. EPSS: 0.5% chance of exploitation in the next 30 days.

n8n before 2.20.0 contains a credential exfiltration vulnerability in the POST /rest/dynamic-node-parameters/options endpoint that allows authenticated users to bypass Allowed HTTP Request Domains restrictions. Attackers with credential access can cause the n8n server to issue HTTP requests with credentials to unauthorized hosts, exfiltrating sensitive authentication data.

Affected products

• n8n n8n: before 2.20.0 (fixed in 2.20.0)

Published 2026-06-22. Last modified 2026-06-24.