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CVE-2026-21857

Estado: AnalizadaAlta (8.3)—

REDAXO is a PHP-based content management system. Prior to version 5.20.2, authenticated users with backup permissions can read arbitrary files within the webroot via path traversal in the Backup addon's file export functionality. The Backup addon does not validate the `EXPDIR` POST parameter against the UI-generated allowlist of permitted directories. An attacker can supply relative paths containing `../` sequences (or even absolute paths inside the document root) to include any readable file in the generated `.tar.gz` archive. Version 5.20.2 fixes this issue.

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 de red con PR:H (authenticated) sin UI:R sugiere T1210. Path traversal (CWE-22) en parámetro `EXPDIR` permite lectura arbitraria de archivos en webroot (T1005); credenciales de backup pueden exponerse (T1552.001).

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

Vulnerability ScanningUser TrainingThreat Intelligence ProgramRestrict File and Directory PermissionsPrivileged Account ManagementPassword Policies

Tecnologías afectadas (1)

Redaxo — Redaxo

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-21857",
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          "options": [
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          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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      "value": "REDAXO is a PHP-based content management system. Prior to version 5.20.2, authenticated users with backup permissions can read arbitrary files within the webroot via path traversal in the Backup addon's file export functionality. The Backup addon does not validate the `EXPDIR` POST parameter against the UI-generated allowlist of permitted directories. An attacker can supply relative paths containing `../` sequences (or even absolute paths inside the document root) to include any readable file in the generated `.tar.gz` archive. Version 5.20.2 fixes this issue."
    },
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      "lang": "es",
      "value": "REDAXO es un sistema de gestión de contenido basado en PHP. Antes de la versión 5.20.2, los usuarios autenticados con permisos de copia de seguridad pueden leer archivos arbitrarios dentro del directorio raíz web (webroot) mediante salto de ruta en la funcionalidad de exportación de archivos del complemento Backup. El complemento Backup no valida el parámetro POST 'EXPDIR' contra la lista blanca de directorios permitidos generada por la interfaz de usuario. Un atacante puede proporcionar rutas relativas que contengan secuencias '../' (o incluso rutas absolutas dentro del directorio raíz del documento) para incluir cualquier archivo legible en el archivo '.tar.gz' generado. La versión 5.20.2 corrige este problema."
    }
  ],
  "lastModified": "2026-06-17T10:19:02.403",
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