AUGUST 4, 2026
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Case File

CVE-2021-42306

HIGH · CVSS 8.1 EPSS 3.08%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-11-24 · Last synced 2026-08-04

CyberRota Analysis

This is a high severity vulnerability with a CVSS score of 8.1. It affects Microsoft.

CVE
CVE-2021-42306
Severity
HIGH
CVSS
8.1
EPSS
3.08%
Microsoft

Original NVD Description

An information disclosure vulnerability manifests when a user or an application uploads unprotected private key data as part of an authentication certificate keyCredential  on an Azure AD Application or Service Principal (which is not recommended). This vulnerability allows a user or service in the tenant with application read access to read the private key data that was added to the application. Azure AD addressed this vulnerability by preventing disclosure of any private key values added to the application. Microsoft has identified services that could manifest this vulnerability, and steps that customers should take to be protected. Refer to the FAQ section for more information. For more details on this issue, please refer to the MSRC Blog Entry.

Related CVEs

Other vulnerabilities affecting the same vendor(s)