CVE-2026-54123

Medium

Description

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

SeverityMedium

CVSS5.5

Exploit probability—

Product

Microsoft Defender For Endpoint

PublishedAug 11, 2026

First seenAug 11, 2026

Weakness typeCWE-200Sensitive information exposure

How to fix

Update

microsoft defender_for_endpoint101.26042.0020 or later

Patches

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

Affected products

Product	Affected versions	Fixed in
microsoft defender_for_endpoint	101.0.0 ≤ v < 101.26042.0020	101.26042.0020

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

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