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Microsoft Security Response CenterCVE-2026-40379

Azure Entra ID Spoofing Vulnerability

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

Read the vendor bulletin Get alerts for Microsoft Entra ID
9.3CVSS out of 10Critical severity
Scope

What the vendor says is affected

  • Microsoft Entra ID
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-40379View CVSS, KEV, EPSS, and threat context
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