CVE-2026-59208 | n8n is an open source workflow automation platform. Prior to… | CVSS 7.6 HIGH

Description

n8n is an open source workflow automation platform. Prior to 2.27.4 and from 2.28.0 prior to 2.28.1, n8n instances configured with more than one trusted token-exchange issuer resolved external identities to local accounts using only the JWT sub claim and ignored the iss claim, allowing an attacker with a valid token from one trusted issuer and a sub matching a victim under another issuer to authenticate as that victim. This issue is fixed in versions 2.27.4 and 2.28.1.

Metadata

CVE ID: CVE-2026-59208
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-07-02 21:05 UTC
Published: 2026-07-09 15:27 UTC
Last updated: 2026-07-09 15:27 UTC
Primary CWE: CWE-287
CWE-287: Improper Authentication
Vendor / Product: n8n-io / n8n
Sources: cve.org · NVD

Severity & Metrics

7.6 HIGH CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Affected products (1)

Vendor	Product	Platform	Versions
n8n-io	n8n	—	>= 2.28.0, < 2.28.1, < 2.27.4

Weakness (CWE)

CWE	Source	Description
CWE-287	cna	CWE-287: Improper Authentication
CWE-346	cna	CWE-346: Origin Validation Error

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.6	HIGH	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

References (3)

https://github.com/n8n-io/n8n/security/advisories/GHSA-mq3m-f8x3-579w https://github.com/n8n-io/n8n/security/advisories/GHSA-mq3m-f8x3-579w
https://github.com/n8n-io/n8n/releases/tag/n8n%402.27.4 https://github.com/n8n-io/n8n/releases/tag/n8n%402.27.4
https://github.com/n8n-io/n8n/releases/tag/n8n%402.28.1 https://github.com/n8n-io/n8n/releases/tag/n8n%402.28.1