Vulnerability · Published Jul 22, 2026 · Assigned by VulnCheck

CVE-2026-65599n8n before 1.123.64, 2.29.8, and 2.30.1 Credential Exposure via JWT Header

Medium 5.1

In plain English

A medium-severity security flaw in n8n from n8n-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.1Medium

Exploit odds (30 days)0.2%top 83.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	n8n	1.123.64	GHSA-9r8p-h6cc-6qhm
npm	n8n	2.30.1	GHSA-9r8p-h6cc-6qhm
npm	n8n	2.29.8	GHSA-9r8p-h6cc-6qhm

Affected products (as reported)

Vendor	Product	Versions
n8n-io	n8n	0 – before 1.123.64
n8n-io	n8n	2.30.0 – before 2.30.1
n8n-io	n8n	2.0.0-rc.0 – before 2.29.8

Weakness: CWE-312 · Vector: 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

References

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