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CVE-2026-40379

Microsoft Entra Id information disclosure

9.3 CRITICALEPSS 0.95%
  1. Published12 May 2026

Description

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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Affected products

Microsoft Entra Idall versions

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2026-40379 being actively exploited?

CVE-2026-40379 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.95%.

How severe is CVE-2026-40379?

CVE-2026-40379 has a CVSS 3.1 base score of 9.3, rated critical. EPSS estimates a 0.95% probability of exploitation.

Which products are affected by CVE-2026-40379?

Affected products include Microsoft Entra Id.

How do I fix CVE-2026-40379?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-40379 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.