CRITICAL🇵🇱 Wersja polska

CVE-2026-4408

CVSS 9.0v3.1pub. 2026-05-28upd. 2026-07-03

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 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

  • Red Hat Enterprise Linux

    OS
    Redhat
    6.07.09.0

  • Red Hat OpenShift Container Platform

    APP
    Redhat
    4.0

  • Samba

    APP
    Samba
    4.1.0 – 4.21.0 (bez)
🔵
CHECK WITH VENDOR
No clear patch data available. Check vendor references.
Tags
Command Injection
CWE
References

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