CVE-2026-4408
CRITICAL
9,0
Source: [email protected]
Attack Vector: network
Attack Complexity: high
Privileges Required: none
User Interaction: none
Scope: changed
Confidentiality: high
Integrity: high
Availability: high
Description
AI Translation Available
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.
78
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
StableCommon Consequences
Security Scopes Affected:
Confidentiality
Integrity
Availability
Non-Repudiation
Potential Impacts:
Execute Unauthorized Code Or Commands
Dos: Crash, Exit, Or Restart
Read Files Or Directories
Modify Files Or Directories
Read Application Data
Modify Application Data
Hide Activities
Applicable Platforms
Technologies:
Not Technology-Specific, AI/ML, Web Server
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