9.8

CVE-2026-4408

Samba: remote code execution in samr

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Samba ≫ Samba Version >= 4.1.0 < 4.21.0
Redhat ≫ Enterprise Linux Version6.0
Redhat ≫ Enterprise Linux Version7.0
Redhat ≫ Enterprise Linux Version9.0
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 2.5% 0.826
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 9.8 3.9 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
secalert@redhat.com 9 2.2 6
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 9 2.2 6
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

https://access.redhat.com/security/cve/CVE-2026-4408
Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2479762
Third Party Advisory
Issue Tracking
https://bugzilla.samba.org/show_bug.cgi?id=16034
Vendor Advisory
Issue Tracking
https://access.redhat.com/errata/RHSA-2026:22644
Issue Tracking
https://access.redhat.com/errata/RHSA-2026:22963
Issue Tracking
https://access.redhat.com/errata/RHSA-2026:25049
https://access.redhat.com/errata/RHSA-2026:25979
https://access.redhat.com/errata/RHSA-2026:28057
https://access.redhat.com/errata/RHSA-2026:28058
https://access.redhat.com/errata/RHSA-2026:28054
https://access.redhat.com/errata/RHSA-2026:28055
https://access.redhat.com/errata/RHSA-2026:28056
https://access.redhat.com/errata/RHSA-2026:28053
https://access.redhat.com/errata/RHSA-2026:28132
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4408.json
https://access.redhat.com/errata/RHSA-2026:29833
https://access.redhat.com/errata/RHSA-2026:29799
https://access.redhat.com/errata/RHSA-2026:29863