What’s Vulnerable › Vulnerabilities

CVE-2026-54123: Microsoft Defender for Endpoint for Mac Information Disclosure Vulnerability

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-11 · updated 2026-10-30
• Weakness: CWE-200

Description

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

Affected products

• Microsoft Defender for Endpoint for Linux: from 101.0.0 before 101.26042.0020 — fixed in 101.26042.0020
• Microsoft Defender for Endpoint for Linux: from 101.0.0 before 101.26042.0020 — fixed in 101.26042.0020

How to fix

Upgrade to a fixed version: Microsoft Defender for Endpoint for Linux 101.26042.0020; Microsoft Defender for Endpoint for Linux 101.26042.0020. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54123

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