CVE-2026-103246: n8n-Io n8n

High severity, CVSS 7.7. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• n8n-Io n8n: before 2.39.6 (fixed in 2.39.6); from 2.40.0, before 2.40.1 (fixed in 2.40.1)

Published 2026-10-01. Last modified 2026-10-06.