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CVE-2026-27495

Estado: AnalizadaCrítica (9.4)—

n8n is an open source workflow automation platform. Prior to versions 2.10.1, 2.9.3, and 1.123.22, an authenticated user with permission to create or modify workflows could exploit a vulnerability in the JavaScript Task Runner sandbox to execute arbitrary code outside the sandbox boundary. On instances using internal Task Runners (default runner mode), this could result in full compromise of the n8n host. On instances using external Task Runners, the attacker might gain access to or impact other task executed on the Task Runner. Task Runners must be enabled using `N8N_RUNNERS_ENABLED=true`.

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The issue has been fixed in n8n versions 2.10.1, 2.9.3, and 1.123.22. Users should upgrade to one of these versions or later to remediate the vulnerability. If upgrading is not immediately possible, administrators should consider the following temporary mitigations. Limit workflow creation and editing permissions to fully trusted users only, and/or use external runner mode (`N8N_RUNNERS_MODE=external`) to limit the blast radius. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Usuario autenticado con permisos en n8n explota sandbox JavaScript para ejecutar código arbitrario en host (AV:N, PR:L). Logra RCE (T1059) y potencial escalada de privilegios en Task Runners internos (T1068).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramPrivileged Account ManagementExecution PreventionDisable or Remove Feature or ProgramApplication Isolation and SandboxingExploit Protection

Tecnologías afectadas (1)

N8N — N8N

CWE

Referencias

JSON original (NVD)

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      "value": "n8n is an open source workflow automation platform. Prior to versions 2.10.1, 2.9.3, and 1.123.22, an authenticated user with permission to create or modify workflows could exploit a vulnerability in the JavaScript Task Runner sandbox to execute arbitrary code outside the sandbox boundary. On instances using internal Task Runners (default runner mode), this could result in full compromise of the n8n host. On instances using external Task Runners, the attacker might gain access to or impact other task executed on the Task Runner. Task Runners must be enabled using `N8N_RUNNERS_ENABLED=true`. The issue has been fixed in n8n versions 2.10.1, 2.9.3, and 1.123.22. Users should upgrade to one of these versions or later to remediate the vulnerability. If upgrading is not immediately possible, administrators should consider the following temporary mitigations. Limit workflow creation and editing permissions to fully trusted users only, and/or use external runner mode (`N8N_RUNNERS_MODE=external`) to limit the blast radius. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures."
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      "value": "n8n es una plataforma de automatización de flujos de trabajo de código abierto. Prior a las versiones 2.10.1, 2.9.3 y 1.123.22, un usuario autenticado con permiso para crear o modificar flujos de trabajo podría explotar una vulnerabilidad en el sandbox de JavaScript Task Runner para ejecutar código arbitrario fuera del límite del sandbox. En instancias que utilizan Task Runners internos (modo de ejecutor predeterminado), esto podría resultar en un compromiso total del host de n8n. En instancias que utilizan Task Runners externos, el atacante podría obtener acceso o impactar otras tareas ejecutadas en el Task Runner. Los Task Runners deben habilitarse usando 'N8N_RUNNERS_ENABLED=true'. El problema ha sido solucionado en las versiones de n8n 2.10.1, 2.9.3 y 1.123.22. Los usuarios deben actualizar a una de estas versiones o posteriores para remediar la vulnerabilidad. Si la actualización no es posible de inmediato, los administradores deben considerar las siguientes mitigaciones temporales. Limitar los permisos de creación y edición de flujos de trabajo solo a usuarios de plena confianza, y/o usar el modo de ejecutor externo ('N8N_RUNNERS_MODE=external') para limitar el radio de impacto. Estas soluciones provisionales no remedian completamente el riesgo y solo deben usarse como medidas de mitigación a corto plazo."
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