CVE-2026-4408
Full vulnerability record from the local CVENow database.
Description
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.
Severity
CRITICAL
CVSS score
9.8
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-05-28 09:16:47.643000
Last modified
2026-10-26 11:10:00.157000
View original CVE JSON
{
"id": "CVE-2026-4408",
"sourceIdentifier": "[email protected]",
"published": "2026-05-28T09:16:47.643",
"lastModified": "2026-10-26T11:10:00.157",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
},
{
"lang": "es",
"value": "Se encontró un defecto en Samba. Un atacante remoto puede explotar una mala configuración en servidores de archivos Samba y controladores de dominio clásicos que utilizan la característica ’check password script’. Si este script está configurado con el carácter de sustitución %u, el nombre de usuario controlado por el cliente se pasa sin el escape adecuado de los metacaracteres de shell. Esta vulnerabilidad permite a un atacante lograr la ejecución remota de comandos en el sistema afectado. Este problema afecta principalmente a configuraciones no estándar donde el ’check password script’ se usa con %u y el servicio samba-dcerpcd se inicia como un servicio del sistema."
}
],
"affected": [
{
"source": "[email protected]",
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