What is CVE-2026-40379?

CVE-2026-40379 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. Azure Entra ID Spoofing Vulnerability

Which CVE IDs does CVE-2026-40379 cover?

CVE-2026-40379 covers the following CVE IDs: CVE-2026-40379. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-40379?

CVE-2026-40379 has a CVSS v3 base score of 9.3, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-40379?

CVE-2026-40379 affects 1 product, including: Microsoft Entra ID.

CVE-2026-40379CriticalCVSS 9.3

Azure Entra ID Spoofing Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

May 22, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-40379 →

📋 Description

Exposure of sensitive information to an unauthorized actor in Azure Entra ID allows an unauthorized attacker to perform spoofing over a network.

🎯 Affected products1

Microsoft Entra ID

🔗 References (1)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40379