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CVE-2026-40379CriticalRevised 15 May

Azure Entra ID Spoofing Vulnerability

MSRC advisory NVD CVE.org

Assessment

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

Severity
Critical
CVSS base score
9.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C
Impact
Spoofing
EPSS, next 30 days
0.9%Higher than 59.6% of scored CVEs · FIRST model run 29 Sep 2026 · about EPSS
Public exploit code
No Nuclei template lists it
Exploitability
Not assessed
Publicly disclosed
No
Customer action
Not required (service-side fix)
Component
Azure Entra ID
Weakness
CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Issued by
Microsoft
Published
7 May 2026 · May 2026
Last revised
15 May 2026Corrected CVE title. This is an informational change only.

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

Azure
1 affected product
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