NetSight
IP …
critical9.0

CVE-2026-4408

A flaw was found in Samba.

Impact

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.

Affected products

VendorProductAffected versions
RedhatOpenshift Container Platform
Version 4.0
SambaSamba
from 4.1.0 before 4.21.0
RedhatEnterprise Linux
Versions 6.0, 7.0, 9.0

Weakness classification

CWE-78

References