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

CVE-2026-4408

Gravedad CVSS v3.1:
CRÍTICA
Tipo:
CWE-78 Neutralización incorrecta de elementos especiales usados en un comando de sistema operativo (Inyección de comando de sistema operativo)
Fecha de publicación:
28/05/2026
Última modificación:
28/05/2026

Descripción

*** Pendiente de traducción *** A flaw was found in Samba. A remote attacker can exploit a misconfiguration in Samba file servers and classic domain controllers that use the "check password script" feature. If this script is configured with the %u substitution character, the client-controlled username is passed without proper escaping of shell meta-characters. This vulnerability allows an attacker to achieve remote command execution on the affected system. This issue primarily affects non-standard configurations where the "check password script" is used with %u and the samba-dcerpcd service is started as a system service.