CVE-2026-54121Public exploitNetwork attack vector

Domain compromise via unverified certificate chase target

Published Jul 14, 2026 · Updated Jul 14, 2026

Improper authorization in AD CS on affected Microsoft Windows releases allows remote authenticated users to obtain domain controller certificates. During a certificate-enrollment chase, the CA contacts the client-supplied cdc host and trusts returned directory identity data without verifying that the host is a domain controller. Exploitation requires a domain account, an Enterprise CA with chase enabled, a DNS-name template, and callback reachability; the forged certificate grants domain controller authentication.

CVSS severity8.8
High
EPSS probability1.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in AD CS on affected Microsoft Windows releases allows remote authenticated users to obtain domain controller certificates. During a certificate-enrollment chase, the CA contacts the client-supplied cdc host and trusts returned directory identity data without verifying that the host is a domain controller. Exploitation requires a domain account, an Enterprise CA with chase enabled, a DNS-name template, and callback reachability; the forged certificate grants domain controller authentication.

The record

CVE
CVE-2026-54121
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Microsoft
Product
Windows Server 2019
Classifications
CWE-285, T1649
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.17763.0 <10.0.17763.9020

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.9020
Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.33158
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.9339
Microsoft · Windows Server 2012 (Server Core installation)version=6.2.9200.0 <6.2.9200.26226
Microsoft · Windows Server 2012version=6.2.9200.0 <6.2.9200.26226
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.9339
Microsoft · Windows Server 2012 R2 (Server Core installation)version=6.3.9600.0 <6.3.9600.23291
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.9020
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.9339
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.5386
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.33158
Microsoft · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.9020
Microsoft · Windows Server 2012 R2version=6.3.9600.0 <6.3.9600.23291

Published CVSS scores

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-285Improper Authorization
T1649Steal or Forge Authentication Certificates

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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