CVE-2026-59208

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.

CVSS v3 6.8 MEDIUM

6.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.6 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/n8n-io/n8n/releases/tag/n8n%402.27.4	Release Notes
https://github.com/n8n-io/n8n/releases/tag/n8n%402.28.1	Release Notes
https://github.com/n8n-io/n8n/security/advisories/GHSA-mq3m-f8x3-579w	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:n8n:n8n::::::node.js::*
	cpe:2.3:a:n8n:n8n:2.28.0:::::node.js::

History

25 Oct 2026, 17:10

Type	Values Removed	Values Added
Summary		(es) n8n es una plataforma de automatización de flujos de trabajo de código abierto. Antes de la 2.27.4 y desde la 2.28.0 antes de la 2.28.1, las instancias de n8n configuradas con más de un emisor de intercambio de tokens de confianza resolvían identidades externas a cuentas locales utilizando solo la declaración sub de JWT e ignoraban la declaración iss, permitiendo a un atacante con un token válido de un emisor de confianza y un sub que coincidiera con una víctima bajo otro emisor autenticarse como esa víctima. Este problema está solucionado en las versiones 2.27.4 y 2.28.1.

Information

Published : 2026-07-09 16:16

Updated : 2026-10-25 17:10

NVD link : CVE-2026-59208

Mitre link : CVE-2026-59208

CVE.ORG link : CVE-2026-59208

JSON object : View

Products Affected

n8n

n8n

CWE

CWE-287

Improper Authentication

CWE-346

Origin Validation Error

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Antes de la 2.27.4 y desde la 2.28.0 antes de la 2.28.1, las instancias de n8n configuradas con m\u00e1s de un emisor de intercambio de tokens de confianza resolv\u00edan identidades externas a cuentas locales utilizando solo la declaraci\u00f3n sub de JWT e ignoraban la declaraci\u00f3n iss, permitiendo a un atacante con un token v\u00e1lido de un emisor de confianza y un sub que coincidiera con una v\u00edctima bajo otro emisor autenticarse como esa v\u00edctima. Este problema est\u00e1 solucionado en las versiones 2.27.4 y 2.28.1."}], "lastModified": "2026-10-25T17:10:00.197", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "53ADAD49-ACDE-4580-B4BC-AE4DF6D9A560", "versionEndExcluding": "2.27.4"}, {"criteria": "cpe:2.3:a:n8n:n8n:2.28.0:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "811995CE-011B-4680-892C-3D6DA0008411"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}