CVE-2026-54121

high

Description

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

References

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

https://hackread.com/microsoft-certighost-flaw-domain-controller-impersonation/

https://github.com/ZeroDayEvil/CVE-2026-54121

https://github.com/TryA9ain/Certighost_CVE-2026-54121

https://github.com/L0u7r3/certighost

https://github.com/sam00/POC-CVE-2026-54121-Certighost

https://github.com/mwnickerson/certighost-bof

https://github.com/GlendonNotGlen/certighost-cve-2026-54121-slides

https://github.com/HORKimhab/CVE-2026-54121

https://github.com/0xBlackash/CVE-2026-54121

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-44139

Details

Source: Mitre, NVD

Published: 2026-07-14

Updated: 2026-07-21

Named Vulnerability: Certighost

Risk Information

CVSS v2

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 8.8

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

Severity: High

EPSS

EPSS: 0.00778

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability Being Monitored