CVE-2026-103246 [HIGH] – n8n versions before 2.39.6 and 2.40.0 before 2.40.1 fail to validate credential ownership

n8n versions before 2.39.6 and 2.40.0 before 2.40.1 fail to validate credential ownership during inline agent node-tool introspection. Attackers can reference arbitrary credential IDs to decrypt and exfiltrate plaintext secrets to attacker-controlled hosts without ownership verification.