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CVE-2026-28783

Estado: AnalizadaCrítica (9.4)—

Craft is a content management system (CMS). Prior to 5.9.0-beta.1 and 4.17.0-beta.1, Craft CMS implements a blocklist to prevent potentially dangerous PHP functions from being called via Twig non-Closure arrow functions. In order to be able to successfully execute this attack, you need to either have allowAdminChanges enabled on production, or a compromised admin account, or an account with access to the System Messages utility. Several PHP functions are not included in the blocklist, which could allow malicious actors with the required permissions to execute various types of payloads, including RCEs, arbitrary file reads, SSRFs, and SSTIs. This vulnerability is fixed in 5.9.0-beta.1 and 4.17.0-beta.1.

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.

Acceso remoto con privilegios elevados (PR:H) en servicio web (AV:N). Blocklist bypass permite RCE, lectura arbitraria y SSRF vía funciones PHP no bloqueadas en Twig.

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

Privileged Account ManagementDisable or Remove Feature or ProgramVulnerability ScanningThreat Intelligence ProgramRestrict Web-Based ContentNetwork Segmentation

Tecnologías afectadas (1)

Craftcms — Craft CMS

CWE

Referencias

JSON original (NVD)

Mostrar
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      "value": "Craft is a content management system (CMS). Prior to 5.9.0-beta.1 and 4.17.0-beta.1, Craft CMS implements a blocklist to prevent potentially dangerous PHP functions from being called via Twig non-Closure arrow functions. In order to be able to successfully execute this attack, you need to either have allowAdminChanges enabled on production, or a compromised admin account, or an account with access to the System Messages utility. Several PHP functions are not included in the blocklist, which could allow malicious actors with the required permissions to execute various types of payloads, including RCEs, arbitrary file reads, SSRFs, and SSTIs. This vulnerability is fixed in 5.9.0-beta.1 and 4.17.0-beta.1."
    },
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      "value": "Craft es un sistema de gestión de contenido (CMS). Antes de 5.9.0-beta.1 y 4.17.0-beta.1, Craft CMS implementa una lista de bloqueo para evitar que funciones PHP potencialmente peligrosas sean llamadas a través de funciones de flecha Twig no-Closure. Para poder ejecutar este ataque con éxito, se necesita tener allowAdminChanges habilitado en producción, o una cuenta de administrador comprometida, o una cuenta con acceso a la utilidad de Mensajes del Sistema. Varias funciones PHP no están incluidas en la lista de bloqueo, lo que podría permitir a actores maliciosos con los permisos requeridos ejecutar varios tipos de cargas útiles, incluyendo RCEs, lecturas de archivos arbitrarias, SSRFs y SSTIs. Esta vulnerabilidad está corregida en 5.9.0-beta.1 y 4.17.0-beta.1."
    }
  ],
  "lastModified": "2026-06-17T10:29:02.200",
  "configurations": [
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      "nodes": [
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