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CVE-2026-25923

Estado: AnalizadaAlta (8.7)—

my little forum is a PHP and MySQL based internet forum that displays the messages in classical threaded view. Prior to 20260208.1, the application fails to filter the phar:// protocol in URL validation, allowing attackers to upload a malicious Phar Polyglot file (disguised as JPEG) via the image upload feature, trigger Phar deserialization through BBCode [img] tag processing, and exploit Smarty 4.1.0 POP chain to achieve arbitrary file deletion. This vulnerability is fixed in 20260208.1.

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 en red sin autenticación (AV:N/PR:N) a aplicación web expuesta. Cadena: carga de archivo Phar polimórfico como JPEG → deserialización en procesamiento BBCode [img] → gadget chain Smarty → eliminación de archivos arbitrarios.

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 ManagementVulnerability ScanningRestrict Web-Based ContentRestrict File and Directory PermissionsRemote Data StorageNetwork Segmentation

Tecnologías afectadas (1)

Mylittleforum — MY Little Forum

CWE

Referencias

JSON original (NVD)

Mostrar
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      "value": "my little forum is a PHP and MySQL based internet forum that displays the messages in classical threaded view. Prior to 20260208.1, the application fails to filter the phar:// protocol in URL validation, allowing attackers to upload a malicious Phar Polyglot file (disguised as JPEG) via the image upload feature, trigger Phar deserialization through BBCode [img] tag processing, and exploit Smarty 4.1.0 POP chain to achieve arbitrary file deletion. This vulnerability is fixed in 20260208.1."
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      "lang": "es",
      "value": "mi pequeño foro es un foro de internet basado en PHP y MySQL que muestra los mensajes en vista clásica de hilos. Antes de 20260208.1, la aplicación no filtra el protocolo phar:// en la validación de URL, permitiendo a los atacantes subir un archivo Phar Polyglot malicioso (disfrazado como JPEG) a través de la función de subida de imágenes, activar la deserialización de Phar a través del procesamiento de la etiqueta BBCode [img], y explotar la cadena POP de Smarty 4.1.0 para lograr la eliminación arbitraria de archivos. Esta vulnerabilidad está corregida en 20260208.1."
    }
  ],
  "lastModified": "2026-06-17T10:25:26.030",
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