CVE-2026-69395

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Use of Externally-Controlled Format String in Active Directory Certificate Services

Publication date: 2026-09-08

Last updated on: 2026-09-24

Assigner: Microsoft Corporation

Description

Use of externally-controlled format string in Active Directory Certificate Services (AD CS) allows an authorized attacker to disclose information over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-24

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-69395

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	active_directory_certificate_services	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-134	The product uses a function that accepts a format string as an argument, but the format string originates from an external source.

Attack-Flow Graph

Executive Summary

This vulnerability involves a flaw in Active Directory Certificate Services (AD CS) where an attacker can exploit a format string issue to disclose information over a network. It requires authorized access but allows data exposure without direct system compromise.

Impact Analysis

An attacker could exploit this to read sensitive information from AD CS, potentially exposing user credentials, certificates, or other confidential data. This could lead to further attacks like privilege escalation or unauthorized access.

Compliance Impact

This vulnerability could lead to unauthorized data disclosure, violating GDPR's data protection requirements or HIPAA's safeguards for protected health information. Organizations may face compliance penalties if exploited.

Mitigation Strategies

Apply the latest security updates from Microsoft for Active Directory Certificate Services. Review and restrict access permissions for AD CS components. Monitor network traffic for unusual certificate-related activities.

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