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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
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.
Metrics
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CVE Modified by Red Hat, Inc.6/15/2026 6:16:17 PM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:25979
CVE Modified by Red Hat, Inc.6/10/2026 12:17:13 PM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:25049
Initial Analysis by NIST6/08/2026 11:28:16 AM
Action
Type
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New Value
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CVSS V3.1
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Added
CPE Configuration
OR
*cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
*cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
*cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*
*cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
*cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* versions from (including) 4.1.0 up to (excluding) 4.21.0
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:22644 Types: Issue Tracking
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:22963 Types: Issue Tracking
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-4408 Types: Third Party Advisory
Added
Reference Type
Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2479762 Types: Issue Tracking, Third Party Advisory
Added
Reference Type
Red Hat, Inc.: https://bugzilla.samba.org/show_bug.cgi?id=16034 Types: Issue Tracking, Vendor Advisory
CVE Modified by Red Hat, Inc.6/03/2026 8:16:59 PM
Action
Type
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New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:22963
CVE Modified by Red Hat, Inc.6/03/2026 2:16:33 AM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:22644
New CVE Received from Red Hat, Inc.5/28/2026 5:16:47 AM
Action
Type
Old Value
New Value
Added
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.
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