Improper Certificate Validation in Samba - CVE-2026-3012
Published: May 27, 2026
Vulnerability identifier: #VU132342
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-3012
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Samba
Affected software:
Samba
Samba
Detailed vulnerability description
The vulnerability allows a remote attacker to compromise certificate trust during auto-enrolment.
The vulnerability exists due to improper certificate validation in auto-enrolment GPO certificate installation when fetching a CA certificate over HTTP without verification. A remote attacker can tamper with the certificate retrieval process to compromise certificate trust during auto-enrolment.
The issue arises because HTTP was trusted for bootstrapping a certificate chain even when a more secure encrypted LDAP channel was available.
How to mitigate CVE-2026-3012
Install security update from vendor's website.