Spoofing Vulnerability in Microsoft Azure Entra ID
CVE-2026-40379

9.3CRITICAL

Key Information:

Vendor

Microsoft
Status
Microsoft Entra
Vendor
CVE Published:
12 May 2026

What is CVE-2026-40379?

The vulnerability in Microsoft Azure Entra ID allows unauthorized actors to gain access to sensitive information, potentially facilitating spoofing attacks over a network. This creates significant risks for organizations relying on Azure Entra ID for identity management and security. Attackers can exploit this weakness to impersonate users, leading to unauthorized actions and data breaches. Organizations should implement recommended patches to mitigate this risk.

Affected Version(s)

Microsoft Entra -

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.