CVE-2026-4408

{"id": "CVE-2026-4408", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "secalert@redhat.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 9.0, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 2.2}]}, "published": "2026-05-28T09:16:47.643", "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:22644", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:22963", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-4408", "source": "secalert@redhat.com"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479762", "source": "secalert@redhat.com"}, {"url": "https://bugzilla.samba.org/show_bug.cgi?id=16034", "source": "secalert@redhat.com"}], "vulnStatus": "Undergoing Analysis", "weaknesses": [{"type": "Secondary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-78"}]}], "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."}], "lastModified": "2026-06-04T00:16:59.663", "sourceIdentifier": "secalert@redhat.com"}