What is CVE-2026-54123?

CVE-2026-54123 is a medium-severity vulnerability in Microsoft Defender For Endpoint Mac, classified under Information Disclosure. CVSS score: 5.5/10. Published 2026-08-11.

How severe is CVE-2026-54123?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Information disclosure in Microsoft Defender For Endpoint Mac

CVE-2026-54123

Exposure of sensitive information to an unauthorized actor in Microsoft Defender for Endpoint allows an authorized attacker to disclose information locally.

Vulnerability class: Information Disclosure

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Microsoft Defender For Endpoint Mac — versions 101.0.0

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

Microsoft Defender for Endpoint for Mac Information Disclosure Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-54123?: CVE-2026-54123 is a medium-severity vulnerability in Microsoft Defender For Endpoint Mac, classified under Information Disclosure. CVSS score: 5.5/10. Published 2026-08-11.
How severe is CVE-2026-54123?: Medium severity. CVSS v3 base score is 5.5 out of 10.