CVE-2026-54121

Analyzed Analyzed - Analysis Complete

Improper Authorization in Active Directory Certificate Services

Publication date: 2026-07-14

Last updated on: 2026-07-21

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-07-14

Last Modified

2026-07-21

Generated

2026-08-04

AI Q&A

2026-07-15

EPSS Evaluated

2026-08-02

NVD

CVE-2026-54121

EUVD

EUVD-2026-44139

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9339 (exc)
microsoft	windows_10_1607	to 10.0.14393.9339 (exc)
microsoft	windows_10_1809	to 10.0.17763.9020 (exc)
microsoft	windows_10_1809	to 10.0.17763.9020 (exc)
microsoft	windows_server_2016	to 10.0.14393.9339 (exc)
microsoft	windows_server_2019	to 10.0.17763.9020 (exc)
microsoft	windows_server_2022	to 10.0.20348.5386 (exc)
microsoft	windows_server_2025	to 10.0.26100.33158 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-285	The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

Executive Summary

This vulnerability is an improper authorization flaw in Active Directory Certificate Services (AD CS). An authorized attacker can exploit it over a network to elevate their privileges.

Impact Analysis

An attacker could gain higher-level access to systems or data, potentially allowing them to take control of affected networks or steal sensitive information.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating compliance requirements such as GDPR or HIPAA, which mandate strict access controls and data protection.

Mitigation Strategies

Apply the latest security updates from Microsoft for Active Directory Certificate Services as soon as possible to address the improper authorization issue.

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