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Affected Component
Analysis
samba
Exploitable
Name
CVE-2026-4408
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.
CWEs
Published Date
Updated Date
Workaround
-
Advisories
https://access.redhat.com/errata/RHSA-2026:22644Issue Tracking
https://access.redhat.com/errata/RHSA-2026:22963Issue Tracking
https://access.redhat.com/security/cve/CVE-2026-4408Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2479762Issue Tracking
https://bugzilla.samba.org/show_bug.cgi?id=16034Issue Tracking
Analysis#
Vulnerability Ratings#
9
CVSSv31
9.8
CVSSv31
NaN
other