What is CVE-2026-54123?

CVE-2026-54123 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Microsoft Defender for Endpoint for Mac Information Disclosure Vulnerability

Which CVE IDs does CVE-2026-54123 cover?

CVE-2026-54123 covers the following CVE IDs: CVE-2026-54123. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-54123?

CVE-2026-54123 has a CVSS v3 base score of 5.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-54123?

CVE-2026-54123 affects 1 product, including: Microsoft Defender for Endpoint for Mac.

CVE-2026-54123HighCVSS 5.5

Microsoft Defender for Endpoint for Mac Information Disclosure Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

August 14, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-54123 →

📋 Description

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

🎯 Affected products1

Microsoft Defender for Endpoint for Mac

✅ Remediation

KBRelease Notes (Security Update) — fixed build 101.26042.0020

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54123
referencehttps://learn.microsoft.com/en-us/defender-endpoint/mac-updates?view=o365-worldwide