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EXPOSURES › CVE-2026-4408

CVE-2026-4408

CRITICAL
DETAIL
SourceNVD · cve Published2026-05-28 CVSS9.0 Referencehttps://nvd.nist.gov/vuln/detail/CVE-2026-4408 ↗
⚡ RCE ◐ ZERO-DAY SHAME 50/100 rcezero-day

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

▸ RECOMMENDED ACTION  Remote code execution — patch the affected products on priority.

PLAYERS IMPLICATED
redhat · vendorsamba · vendorenterprise linux · productopenshift container platform · productsamba · product
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 FEDRAMP PRODUCTS · 0
No correlated FedRAMP products.