What’s Vulnerable › Vulnerabilities

CVE-2026-40379: Azure Entra ID Spoofing Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-12 · updated 2026-10-26
• Weakness: CWE-200

Description

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

Affected products

• Microsoft Entra: all versions
• Microsoft Entra: all versions

References

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

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