CVE-2026-4408

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.

Score
CVSS 3.1 9.8 Critical
Status
Modified - secalert@redhat.com
Published
2026-05-28
Last modified
2026-10-26
Weaknesses
CWE-78

Affected products

References

 
 
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