CVE-2026-65599: n8n

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

n8n versions before 1.123.64, 2.29.8, and 2.30.1 contain a credential exposure vulnerability: when configured with a Google Service Account key, the full PEM private key was mistakenly placed in the JWT header's kid field (intended only for a key identifier). Because JWT headers are Base64-encoded rather than encrypted, the private key could be recovered by anything that logged or inspected the JWT. An attacker who obtained the key could impersonate the service account and access or modify any Google Cloud resource it was authorized to use. Only instances using Google Service Account credentials are affected.

Affected products

• n8n n8n: before 1.123.64 (fixed in 1.123.64); from 2.0.0, before 2.29.8 (fixed in 2.29.8); version 2.30.0 only

Published 2026-07-22. Last modified 2026-07-27.