VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVReported exploited: VulnCheck KEV since Published CVSS 8.8 highEPSS 1.8% probability of exploitation in 30 days
Microsoft

CVE-2026-54121: Active Directory Certificate Services Elevation of Privilege Vulnerability

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .

VulnCheck KEV lists it since . It cites 1 public report, the first from .

How likely is exploitation in the next 30 days?
1.8%

Up from 0.8% on .

EPSS score, percentile 79.2 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
8.8 High

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (1)

Which versions are affected?

Affected

  • from 10.0.14393.0 to before 10.0.14393.9339
  • from 10.0.17763.0 to before 10.0.17763.9020
  • from 6.2.9200.0 to before 6.2.9200.26226
  • from 6.2.9200.0 to before 6.2.9200.26226
  • from 6.3.9600.0 to before 6.3.9600.23291
  • from 6.3.9600.0 to before 6.3.9600.23291

and 7 more in the table below

Versions by product

Source: CISA KEV 2026.11.10, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

Description

Active Directory Certificate Services Elevation of Privilege Vulnerability

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

Source: CVE List, as of . About the data.

What to do

Advisories and patches

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (13 products)
Microsoft Windows 10 Version 1607
StatusVersions
Affectedfrom 10.0.14393.0 to before 10.0.14393.9339
Microsoft Windows 10 Version 1809
StatusVersions
Affectedfrom 10.0.17763.0 to before 10.0.17763.9020
Microsoft Windows Server 2012
StatusVersions
Affectedfrom 6.2.9200.0 to before 6.2.9200.26226
Microsoft Windows Server 2012 (Server Core installation)
StatusVersions
Affectedfrom 6.2.9200.0 to before 6.2.9200.26226
Microsoft Windows Server 2012 R2
StatusVersions
Affectedfrom 6.3.9600.0 to before 6.3.9600.23291
Microsoft Windows Server 2012 R2 (Server Core installation)
StatusVersions
Affectedfrom 6.3.9600.0 to before 6.3.9600.23291
Microsoft Windows Server 2016
StatusVersions
Affectedfrom 10.0.14393.0 to before 10.0.14393.9339
Microsoft Windows Server 2016 (Server Core installation)
StatusVersions
Affectedfrom 10.0.14393.0 to before 10.0.14393.9339
Microsoft Windows Server 2019
StatusVersions
Affectedfrom 10.0.17763.0 to before 10.0.17763.9020
Microsoft Windows Server 2019 (Server Core installation)
StatusVersions
Affectedfrom 10.0.17763.0 to before 10.0.17763.9020
Microsoft Windows Server 2022
StatusVersions
Affectedfrom 10.0.20348.0 to before 10.0.20348.5386
Microsoft Windows Server 2025
StatusVersions
Affectedfrom 10.0.26100.0 to before 10.0.26100.33158
Microsoft Windows Server 2025 (Server Core installation)
StatusVersions
Affectedfrom 10.0.26100.0 to before 10.0.26100.33158

Source: CVE List, as of . About the data.

Weakness

CWE-285

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published
CVE record last updated

Known exploited Microsoft vulnerabilities

  • CVE-2026-124194: Microsoft Office Outlook Missing User Interaction for Potentially Unsafe Action Vulnerability (added )
  • CVE-2026-96951: Microsoft Windows Command Injection Vulnerability (added )
  • CVE-2026-65660: Microsoft SharePoint Code Injection Vulnerability (added )
  • CVE-2026-81963: Microsoft Windows Link Following Vulnerability (added )
  • CVE-2026-85880: Microsoft Windows Heap-Based Buffer Overflow Vulnerability (added )