CVE-2026-40379: Exposure of sensitive information to an unauthorized actor in Azure Entra ID allows an unauthorized attacker t

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CRITICAL 9.3WATCHLISTMITIGATE

CVE-2026-40379 is a critical-severity flaw (CVSS 9.3) affecting entra id. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.3 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-200
Published	2026-05-12
Last modified	2026-10-26

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-12 18:17 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

microsoft entra id MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy entra-id || rpm -q entra-id || entra-id --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40379?

entra id: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-40379 being exploited?

CVE-2026-40379 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40379 affect?

CVE-2026-40379 affects entra id. Severity is critical (CVSS 9.3). Exposure of sensitive information to an unauthorized actor in Azure Entra ID allows an unauthorized attacker to perform spoofing over a network.

How urgent is CVE-2026-40379?

Priority 52/100. Critical severity; On your watchlist

Software pages

Azure vulnerabilities

Related CVEs

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CVE-2026-69836 CRITICAL 10.0 MITIGATE Deserialization of untrusted data in Microsoft Entra ID allows an unauthorized attacker to execute code over a
CVE-2026-69851 CRITICAL 9.9 MITIGATE Server-side request forgery (ssrf) in Azure Active Directory allows an authorized attacker to elevate privileg
CVE-2026-83941 CRITICAL 9.9 MITIGATE Missing authorization in Entra ID allows an authorized attacker to elevate privileges over a network.

References

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