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Public proof of conceptFix available

CVE-2026-54121

Active Directory Certificate Services Elevation of Privilege Vulnerability

A public proof of concept exists; no exploitation attested.

  • Published2026-07-14
  • WeaknessCWE-285

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Improper authorization in Active Directory Certificate Services (AD CS) allows an authorized attacker to elevate privileges over a network.

Timeline

dates in UTC
  1. 2026-07-1417:08CVE publishedCNA
  2. 2026-07-1418:18CVE publishedNVD

Versions per branch

NVD
Microsoft windows server 2012
BranchAffectedFixed in
—all versionsno fix published
—= r2no fix published
Microsoft windows 10 1607
BranchAffectedFixed in
10.0< 10.0.14393.933910.0.14393.9339
Microsoft windows 10 1809
BranchAffectedFixed in
10.0< 10.0.17763.902010.0.17763.9020

4 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA13 products

As microsoft, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Microsoft Windows 10 Version 1607

    platforms: 32-bit Systems, x64-based Systems

    Affected
    • ≥ 10.0.14393.0, < 10.0.14393.9339fixed in 10.0.14393.9339custom
  • Microsoft Windows 10 Version 1809

    platforms: 32-bit Systems, x64-based Systems

    Affected
    • ≥ 10.0.17763.0, < 10.0.17763.9020fixed in 10.0.17763.9020custom
  • Microsoft Windows Server 2012

    platforms: x64-based Systems

    Affected
    • ≥ 6.2.9200.0, < 6.2.9200.26226fixed in 6.2.9200.26226custom
  • Microsoft Windows Server 2012 (Server Core installation)

    platforms: x64-based Systems

    Affected
    • ≥ 6.2.9200.0, < 6.2.9200.26226fixed in 6.2.9200.26226custom
  • Microsoft Windows Server 2012 R2

    platforms: x64-based Systems

    Affected
    • ≥ 6.3.9600.0, < 6.3.9600.23291fixed in 6.3.9600.23291custom
  • Microsoft Windows Server 2012 R2 (Server Core installation)

    platforms: x64-based Systems

    Affected
    • ≥ 6.3.9600.0, < 6.3.9600.23291fixed in 6.3.9600.23291custom

7 more products in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-10-28

Fix

Advisories and patches

Detection

read 2026-11-06 06:14 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2026-07-14
Last Modified
2026-07-21
NVD status
Analyzed
GitHub Advisory
GHSA-64qv-2ffq-h4w6

Frequently asked questions

What is CVE-2026-54121?

Improper authorization in Active Directory Certificate Services (AD CS) allows an authorized attacker to elevate privileges over a network.

Is CVE-2026-54121 actively exploited?

Active exploitation of CVE-2026-54121 has not been confirmed. Its EPSS score was 1.8% on 2026-11-07, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-54121?

CVE-2026-54121 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record