CVE-2026-4408
CRITICAL
INFO
Priority: 0.25
BB Relevance:
80/100
Published: 2026-05-28
Modified: 2026-10-26
First seen: 2026-10-29
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
Unchanged
C:
High
I:
High
A:
High
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.
Weakness Classification (1)
Affected Software (5)
| Vendor | Product | Version |
|---|---|---|
| redhat | enterprise_linux | 6.0 |
| redhat | enterprise_linux | 7.0 |
| redhat | enterprise_linux | 9.0 |
| redhat | openshift_container_platform | 4.0 |
| samba | samba | 4.1.0 – 4.21.0 |
References & Advisories (25)
Third Party Advisory
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Vendor Advisory
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Third Party Advisory
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