CVE-2026-4408
Published: May 28, 2026
Modified: Jun 3, 2026
CVSS v3.1
9.0
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.
| Vendor | Product | Versions |
|---|---|---|
Red Hat | Red Hat Enterprise Linux 10 | unaffected 0:4.23.5-109.el10_2 - < * |
Red Hat | Red Hat Enterprise Linux 8 | unaffected 0:4.19.4-16.el8_10 - < * |
Red Hat | Red Hat Enterprise Linux 8 | unaffected 0:4.19.4-16.el8_10 - < * |
Red Hat | Red Hat Enterprise Linux 6 | All versions |
Red Hat | Red Hat Enterprise Linux 6 | All versions |
Red Hat | Red Hat Enterprise Linux 7 | All versions |
Red Hat | Red Hat Enterprise Linux 9 | All versions |
Red Hat | Red Hat OpenShift Container Platform 4 | All versions |
Weaknesses (CWE)
CVSS v3.1 Details
CVSS v3.1 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
References
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