CVE-2021-42306

Azure Active Directory Information Disclosure Vulnerability

HIGH

8.1

CVSS Score

Published: November 24, 2021 at 01:05 AM UTC

Updated: August 19, 2026 at 05:35 PM UTC

5 products affected across 1 vendorAzure Active DirectoryAzure AutomationAzure Migrate

Using Azure Automation by Microsoft?

Get instant alerts when new vulnerabilities affect Azure Automation - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

HIGH8.1

Exploit prediction

EPSS 3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Azure Active Directory · Microsoft

95%

v < 2021-10-30

Affected range stops below 2021-10-30, so it looks safe — our inference, not a vendor statement

Azure Active Site Recovery · Microsoft

95%

v < 2021-11-01

Affected range stops below 2021-11-01, so it looks safe — our inference, not a vendor statement

Azure Automation · Microsoft

95%

v < 2021-10-151.0.0 ≤ v < publication1.0.0

Affected range stops below 2021-10-15, so it looks safe — our inference, not a vendor statement

Affected range stops below publication, so it looks safe — our inference, not a vendor statement

Azure Migrate · Microsoft

95%

v < 2021-11-02

Affected range stops below 2021-11-02, so it looks safe — our inference, not a vendor statement

Azure Site Recovery · Microsoft

60%

All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

PatchVendor Advisory

Source: [email protected]

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42306

Vendor AdvisoryPatch

Source: cverecord

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42306

CVSS

8.1HIGHmicrosoft

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-522

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card