EUVD-2026-44139
GHSA-64qv-2ffq-h4w6
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable AD CS enrollment abusable by any authenticated low-privilege domain user with no interaction, yielding privileged access with full CIA impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Improper authorization in Active Directory Certificate Services (AD CS) allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Privilege escalation in Microsoft Active Directory Certificate Services (AD CS) allows an authenticated network attacker to elevate privileges due to improper authorization (CWE-285) in certificate request/enrollment handling across Windows Server 2012 through 2025 and their Server Core installations. With a CVSS 3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N) and full high impact to confidentiality, integrity, and availability, a low-privileged domain user can abuse AD CS authorization checks to gain elevated rights, potentially up to domain compromise. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The environment must run the AD CS Certification Authority role (an enterprise CA) reachable over the network by the attacker, and the attacker must hold a valid low-privileged authenticated domain identity (CVSS PR:L) - this is not exploitable by a fully unauthenticated outsider. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine prioritization candidate, not merely a high-CVSS paper risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has compromised or been granted a low-privilege domain account connects over the network to the enterprise AD CS Certification Authority and submits a crafted certificate request that the improper authorization check fails to reject. The issued certificate grants authentication as a higher-privileged principal, which the attacker then uses to escalate toward domain administrator. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-54121 for each affected OS as listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54121 (exact fixed build numbers are enumerated per product in the MSRC update guide; no standalone version string was provided in the input, so cite the KB from the advisory for your specific OS). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows Server instances running AD CS Certificate Authority roles and document their current patch levels. …
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Same weakness CWE-285 – Improper Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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