Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

CVE-2026-6257

Gravedad CVSS v4.0:
CRÍTICA
Tipo:
CWE-434 Subida sin restricciones de ficheros de tipos peligrosos
Fecha de publicación:
20/04/2026
Última modificación:
21/04/2026

Descripción

*** Pendiente de traducción *** Vvveb CMS v1.0.8 contains a remote code execution vulnerability in its media management functionality where a missing return statement in the file rename handler allows authenticated attackers to rename files to blocked extensions .php or .htaccess. Attackers can exploit this logic flaw by first uploading a text file and renaming it to .htaccess to inject Apache directives that register PHP-executable MIME types, then uploading another file and renaming it to .php to execute arbitrary operating system commands as the www-data user.