CRITICAL 9.3 Microsoft
CVE-2026-40379
Azure Entra ID Spoofing Vulnerability
Microsoft Security Update 2026-May: Azure Entra ID Spoofing Vulnerability
Affected Products
- Microsoft Entra ID
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40379
- https://nvd.nist.gov/vuln/detail/CVE-2026-40379
This critical severity vulnerability with a CVSS score of 9.3 was published on 2026-05-12 via Microsoft. Affected: Microsoft Entra ID.
Risk Timeline
CVE Disclosed2026-05-12 · 128 days ago
Remediation Resources
Official Advisory
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40379NVD / MITRE
nvd.nist.gov/vuln/detail/CVE-2026-40379Related Vulnerabilities
| CVE | Title | Severity | CVSS |
|---|---|---|---|
| CVE-2026-83711 | Microsoft Azure Active Directory B2C Elevation of Privilege Vulnerability | CRITICAL | 10.0 |
| CVE-2025-55241 | Azure Entra ID Elevation of Privilege Vulnerability | CRITICAL | 10.0 |
| CVE-2026-63508 | Microsoft Planetary Computer Pro Elevation of Privilege Vulnerability | CRITICAL | 10.0 |
| CVE-2026-65667 | Microsoft Teams Elevation of Privilege Vulnerability | CRITICAL | 10.0 |
| CVE-2026-65801 | Microsoft Exchange Online Elevation of Privilege Vulnerability | CRITICAL | 10.0 |
| CVE-2026-69836 | Microsoft Entra ID Remote Code Execution Vulnerability | CRITICAL | 10.0 |
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