CVE-2026-103256 n8n before 2.39.6 and 2.40.x before 2.40.1 Credentials Leak via preAuthentication Hook

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...