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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."}],"id":"CVE-2026-4408","lastModified":"2026-11-04T23:17:36.317","metrics":{"cvssMetricV31":[{"cvssData":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.0,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"exploitabilityScore":2.2,"impactScore":6.0,"source":"secalert@redhat.com","type":"Secondary"},{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"exploitabilityScore":3.9,"impactScore":5.9,"source":"nvd@nist.gov","type":"Primary"},{"cvssData":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.0,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"exploitabilityScore":2.2,"impactScore":6.0,"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","type":"Secondary"}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"id":"CVE-2026-4408","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA 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