CVE-2026-65599

n8n before 1.123.64, 2.29.8, and 2.30.1 Credential Exposure via JWT Header

State: Published
Severity: 5.1 Medium
Published: Jul 22, 2026
Updated: Oct 29, 2026
Reserved: Jul 22, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:L/SA:L	VulnCheck

Weaknesses

CWE-312 Cleartext Storage of Sensitive Information

Affected Products

Product	Versions
n8nn8n-io	before 1.123.64Affected 1.123.64Not affected
n8nn8n-io	2.30.0 to before 2.30.1Affected 2.30.1Not affected
n8nn8n-io	2.0.0-rc.0 to before 2.29.8Affected 2.29.8Not affected

References

GitHub Security Advisory (GHSA-9r8p-h6cc-6qhm)vendor-advisory
VulnCheck Advisory: n8n before 1.123.64 Credential Exposure via JWT Headerthird-party-advisory

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