> CVE-2026-4408 [CRITICAL]

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PUBLISHED
2026-05-28 09:16
MODIFIED
2026-05-28 09:16
CVSS_SCORE V3
9.0
EPSS (Prob. Exploit)
2.50%
Top 15.3%
DATA SOURCES:
NVD 🔗 2026-05-28 RED HAT 🔗 2026-05-31 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-11-01 OSV 🔗 2026-11-02

> DESCRIPTION

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

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
EXPLOITABILITY
2.2
IMPACT
6.0

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
High (H)
Conditions spécifiques doivent être réunies pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Changed (C)
Impact s'étend au-delà du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
High (H)
Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
High
Interruption totale du service possible

> WEAKNESSES

CWE-78

> CWE DETAILED DESCRIPTIONS

CWE-78: Improper Neutralization of Special Elements used in an OS Command - 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 before it is sent to a downstream component.

> RED HAT SECURITY ADVISORIES

Red Hat Security Advisory: samba security update
An update for samba is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CV...
Red Hat Security Advisory: samba security update
An update for samba is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CV...
Red Hat Security Advisory: samba security update
An update for samba is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVS...
Red Hat Security Advisory: samba security update
An update for samba is now available for Red Hat Enterprise Linux 9.6 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulner...
Red Hat Security Advisory: samba security update
An update for samba is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Important. A Com...
Red Hat Security Advisory: samba security update
An update for samba is now available for Red Hat Enterprise Linux 10.0 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulne...
Red Hat Security Advisory: samba security update
An update for samba is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service. Red Hat Product Security ha...
Red Hat Security Advisory: samba security update
An update for samba is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On. Red Hat Produ...
Red Hat Security Advisory: samba security update
An update for samba is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On. Red Hat Produ...
Red Hat Security Advisory: samba security update
An update for samba is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulne...
Red Hat Security Advisory: samba security update
An update for samba is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Important. A Com...
Red Hat Security Advisory: OpenShift Container Platform 4.20.27 bug fix and security update
Red Hat OpenShift Container Platform release 4.20.27 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red H...
Red Hat Security Advisory: OpenShift Container Platform 4.21.22 bug fix and security update
Red Hat OpenShift Container Platform release 4.21.22 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red H...
Red Hat Security Advisory: OpenShift Container Platform 4.19.36 bug fix and security update
Red Hat OpenShift Container Platform release 4.19.36 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red...
Red Hat Security Advisory: OpenShift Container Platform 4.18.54 bug fix and security update
Red Hat OpenShift Container Platform release 4.18.54 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red...
Red Hat Security Advisory: OpenShift Container Platform 4.16.69 bug fix and security update
Red Hat OpenShift Container Platform release 4.16.69 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red...
Red Hat Security Advisory: OpenShift Container Platform 4.14.72 bug fix and security update
Red Hat OpenShift Container Platform release 4.14.72 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red...
Red Hat Security Advisory: OpenShift Container Platform 4.15.68 bug fix and security update
Red Hat OpenShift Container Platform release 4.15.68 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red H...
Red Hat Security Advisory: OpenShift Container Platform 4.12.97 bug fix and security update
Red Hat OpenShift Container Platform release 4.12.97 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red H...
Red Hat Security Advisory: OpenShift Container Platform 4.17.57 bug fix and security update
Red Hat OpenShift Container Platform release 4.17.57 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red...
Red Hat Security Advisory: OpenShift Container Platform 4.13.71 bug fix and security update
Red Hat OpenShift Container Platform release 4.13.71 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red H...

> RED HAT SEVERITY ASSESSMENT

THREAT SEVERITY
Important

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Samba: remote code execution in samr

AFFECTED PACKAGES:
Unknown / Unknown

> HISTORIQUE DES MODIFICATIONS

Première apparition
28/05/2026 09:16
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:59
CWE
Champ modifié: Description CWE
Ancienne valeur:
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 upstr...
Nouvelle valeur:
CWE-78: Improper Neutralization of Special Elements used in an OS Command - The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it doe...
📊 ENRICHISSEMENT 01/06/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
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 upstr...
📊 ENRICHISSEMENT 31/05/2026 05:02
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
N/A
Nouvelle valeur:
{ "threat_severity": "Important", "severity_scale": null }
📊 ENRICHISSEMENT 31/05/2026 05:02
REDHAT
Champ modifié: Red Hat
Ancienne valeur:
Non
Nouvelle valeur:
Oui
Total des modifications: 4 Dernière mise à jour: 6 days ago

> REFERENCES

https://access.redhat.com/security/cve/CVE-2026-4408
https://bugzilla.redhat.com/show_bug.cgi?id=2479762
https://bugzilla.samba.org/show_bug.cgi?id=16034
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