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Microsoft Security Response CenterCVE-2026-40379

Azure Entra ID Spoofing Vulnerability

CriticalVendor CVSS 9.3 / 10 1 CVE Published May 7, 2026 at 7:00 AM UTC

Summary

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

Products covered

  • Microsoft Entra ID

Remediation

Separate remediation guidance was not included in the collected bulletin.

CVEs in this advisory 1

Updates

  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.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.