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CVE-2026-54123

Microsoft Defender for Endpoint for Mac Information Disclosure Vulnerability

MEDIUM
5.5
CVSS Score
Published: August 11, 2026 at 05:04 PM UTC
Updated: October 30, 2026 at 05:20 PM UTC
1 product affected across 1 vendorDefender for Endpoint

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Defender for Endpoint· Microsoft
95%
101.0.0 ≤ v < 101.26042.0020101.0.0
Affected range stops below 101.26042.0020, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: [email protected]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54123

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUMmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-200

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