CVE-2026-4408criticalCWE-78

Samba: remote code execution in samr

48Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 9epss 2.5%

from disclosure to weapon67 days

Published on NVDMay 28

1st PoC+67d

exploitation probability

2.5%top 17% of all CVEs

observed exploitation

nono source reports it

1 public exploit(s)

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

public PoCs found — 1

githubgithub.com/SafeBreach-Labs/ForgottenButNotGone★ 11

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

References