CVE-2026-40379

high

Description

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

References

Advisories
References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40379

https://thehackernews.com/2026/05/microsoft-patches-138-vulnerabilities.html

Details

Source: Mitre, NVD

Published: 2026-05-12

Updated: 2026-05-21

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N

Severity: High

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Severity: High

EPSS

EPSS: 0.00059