Vulnerability intelligence

CVE-2026-4408

Red Hat Red Hat Enterprise Linux 10 CWE-78

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.

CVSS Score

Critical

EPSS — Exploit Probability

2.5%

Riskier than 84% of all CVEs · checked 2026-09-07

Exploitation

Not in CISA KEV

KEV does not include every exploited vulnerability

Remediation

unknown

Check vendor advisories

NVD entry PoC / advisory