CVE-2026-4408

CVE-2026-4408 · Samba: remote code execution in samr

This page contains facts from public vulnerability sources. Check the original advisory before updating.

This page shows selected source facts. See the linked advisories for the complete description and affected versions.

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 9.0 · Critical · EPSS 1.8% · Fix available

Published

2026-05-28T07:25:27.169Z

Updated

2026-10-08T21:02:26.752Z

Stack: system

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