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CVE-2026-54301

Estado: AnalizadaAlta (7)—

n8n is an open source workflow automation platform. Prior to 1.123.55, 2.25.7, and 2.26.2, an authenticated user with workflow edit access could configure a Respond to Webhook node to serve binary content with an attacker-controlled Content-Type. The binary response path bypassed the central Content-Security-Policy sandbox header, allowing a public webhook to execute JavaScript in the n8n origin when visited by an authenticated user, with access to that user's session. This vulnerability is fixed in 1.123.55, 2.25.7, and 2.26.2.

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.

XSS en webhook (CWE-79) con ejecución de JavaScript en origen n8n. Requiere autenticación y UI:P (usuario autenticado visita webhook), activando T1189. Impactos: T1059.007 (JavaScript en navegador) y T1078 (acceso a sesión autenticada).

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

User TrainingRestrict Web-Based ContentApplication Developer GuidanceActive Directory ConfigurationUser Account ManagementPrivileged Account Management

Tecnologías afectadas (1)

N8N — N8N

CWE

Referencias

JSON original (NVD)

Mostrar
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          "options": [
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              "exploitation": "none"
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          "version": "2.0.3",
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
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            },
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  "published": "2026-06-23T17:17:06.053",
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  "vulnStatus": "Analyzed",
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    }
  ],
  "lastModified": "2026-06-26T02:25:03.250",
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}