CVE-2026-3012

A flaw was found in Samba’s certificate auto-enrollment Group Policy handling. When certificate auto-enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install it into the local trust store without proper verification. An attacker with the ability to intercept or redirect network traffic could exploit this behavior to supply a malicious certificate authority certificate, potentially allowing interception or spoofing of trusted communications.

What this means for your business

It affects Redhat Openshift Container Platform. It matters if your company, or a supplier that handles your data, runs it.
An attacker can use it from inside the same network, without a login, and without anyone at your company clicking anything.
FIRST's prediction model gives it a 0.3% chance of attack attempts being seen in the next 30 days, ranking above 17% of all known flaws.

What to do

1Check whether your company or your suppliers run Redhat Openshift Container Platform, and which version. The affected versions are listed further down this page.
2If you do, apply the vendor's fix. A patch or vendor advisory has been published.

Not sure if your company is exposed?

Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.

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Scoring

CVSS: 8.0 (v3.1)
Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Weakness: CWE-345
Assigned by: secalert@redhat.com

Dates

Published: 2026-05-27
Last modified: 2026-09-18
Sources: NVD

Affected products

Redhat Openshift Container Platform4.0
Samba Samba4.16.0 - 4.21.0
Redhat Enterprise Linux7.0, 9.0

As listed in the NVD configuration data. Not a statement about your estate.