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CVE Record

CVE-2026-3012: Samba: group policy certificate enrollment uses http:// without validation

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.

HighCVSS 8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Samba may trust a certificate authority certificate fetched over plain HTTP during Group Policy certificate auto-enrollment. If an attacker can intercept or redirect that network path, they could plant a malicious CA and make later trusted communications easier to spoof or intercept.

Executive priority

Treat as high priority for domain-joined Linux and OpenShift environments using Samba Group Policy certificate enrollment. It is not described as internet-wormable or actively exploited, but it can undermine certificate trust and enable serious follow-on interception or spoofing.

Technical view

CVE-2026-3012 is a CWE-345 validation flaw in Samba certificate auto-enrollment Group Policy handling. The reported path retrieves a CA certificate over unencrypted HTTP and installs it into the local trust store without adequate verification. Red Hat rates it high, CVSS 8.0, with changed scope and high confidentiality and integrity impact.

Likely exposure

Exposure appears concentrated in Red Hat systems running affected samba or rhcos packages where certificate auto-enrollment Group Policy is enabled. Listed affected streams include RHEL 7, 8, 9, 10, related EUS/AUS/TUS/SAP variants, and OpenShift Container Platform 4.19. RHEL 6 samba status is listed as unknown.

Exploitation context

The bundle does not show KEV listing or confirmed active exploitation. Exploitation requires the ability to intercept or redirect relevant network traffic and depends on certificate auto-enrollment being enabled, but successful abuse could compromise trust decisions broadly on the host.

Researcher notes

Key conditions are auto-enrollment GPO use and attacker network-position capability. The sources do not provide exploit details here, and none should be assumed. Focus research on trust-store modification paths, HTTP retrieval behavior, package lineage, and Red Hat errata mapping.

Mitigation direction

  • Apply the relevant Red Hat RHSA updates for each affected product stream.
  • Check Red Hat guidance for fixed package versions and operational workarounds.
  • Review whether Samba certificate auto-enrollment Group Policy is enabled.
  • Limit exposure to traffic interception or redirection on management networks.
  • Audit local trust stores for unexpected CA certificates.

Validation and detection

  • Inventory RHEL and OpenShift versions against the affected product list.
  • Check installed samba or rhcos package versions against Red Hat advisories.
  • Confirm whether certificate auto-enrollment Group Policy is configured.
  • Review recent trust store changes for unapproved CA additions.
  • Track RHEL 6 status separately because the bundle marks it unknown.
Prepared
Confidence
high
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-345: Exact CWE lookup

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description · low confidence lookup

Container behavior lookup

The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2026-3012 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
7Timeline events
2ADP providers
15Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8CVSS 3.1HighCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N1.65.8redhat
8CVSS 3.1HighCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N1.65.8redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

8High
CVSS 3.1 vector shape for CVE-2026-3012Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Reported to Red Hat.

  3. Source timelineredhat

    Reported to Red Hat.

  4. ADP timelineredhat-SADP

    Made public.

  5. Source timelineredhat

    Made public.

  6. CVE publishedCVE Program

    The CVE record was published.

  7. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPsamba: group policy certificate enrollment uses http:// without validation
other:Red Hat severity ratingcvssV3_1
  • 2026-03-13T12:55:02.623Z: Reported to Red Hat.
  • 2026-05-27T09:17:49.862Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red HatRed Hat Enterprise Linux 10samba, 0:4.23.5-109.el10_2affected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Supportsamba, 0:4.21.3-114.el10_0.1affected
Red HatRed Hat Enterprise Linux 8samba, 0:4.19.4-16.el8_10affected
Red HatRed Hat Enterprise Linux 8samba, 0:4.19.4-16.el8_10affected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportsamba, 0:4.15.5-16.el8_6.1affected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Onsamba, 0:4.15.5-16.el8_6.1affected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Servicesamba, 0:4.17.5-7.el8_8.1affected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutionssamba, 0:4.17.5-7.el8_8.1affected
Red HatRed Hat Enterprise Linux 9samba, 0:4.23.5-10.el9_8affected
Red HatRed Hat Enterprise Linux 9samba, 0:4.23.5-10.el9_8affected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutionssamba, 0:4.17.5-105.el9_2.5affected
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutionssamba, 0:4.19.4-105.el9_4.4affected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Supportsamba, 0:4.21.3-14.el9_6.1affected
Red HatRed Hat OpenShift Container Platform 4.19rhcos, 4.19.9.6.202606241344-0affected
Red HatRed Hat Enterprise Linux 6sambaunknown
Red HatRed Hat Enterprise Linux 6samba4unknown
Red HatRed Hat Enterprise Linux 7sambaaffected
Weakness

CWE details

CWE-345

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-345 · source CWE mapping

Insufficient Verification of Data Authenticity

Insufficient Verification of Data Authenticity represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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