CVE-2026-54121

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.

Affected

Microsoft · Windows 10 Version 1607 · Windows 10 Version 1809 · Windows Server 2012 · Windows Server 2012 (Server Core installation) · Windows Server 2012 R2 · Windows Server 2012 R2 (Server Core installation)

CVSS v3.1 MICROSOFT

8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.78% chance of exploitation in the next 30 days, 55th percentile

Published

2026-07-14

Updated

2026-10-08

Proof-of-concept exploits (11)

• aniqfakhrul/CVE-2026-54121332★ · 2026-07-28
• marcgoam/CVE-2026-54121-CertiGhost11★ · 2026-07-27
• nafiez/Metasploit-CVE-2026-54121-Certighost4★ · 2026-07-31
• 0xBlackash/CVE-2026-541212★ · 2026-07-25
• HORKimhab/CVE-2026-541210★ · 2026-07-25
• ChPratik/CVE-2026-541211★ · 2026-07-28
• GlendonNotGlen/certighost-cve-2026-54121-slides0★ · 2026-07-26
• KrakenEU/CVE-2026-54121-CertiGhost1★ · 2026-07-31
• sam00/POC-CVE-2026-54121-Certighost0★ · 2026-08-06
• tc4dy/CVE-2026-54121-PoC-Exploit30★ · 2026-09-29
• ushst/CVE-2026-54121-adcs-chase-nxc0★ · 2026-10-15

Security advisories

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54121

References

• CVE Record
• NVD entry

Related

• CVE-2022-22954
• CVE-2018-16382
• CVE-2018-16517
• CVE-2018-19150
• CVE-2019-19197
• CVE-2019-19820