Detections
Analytics

Security Updates for Windows Defender (October 2026)

medium Nessus Plugin ID 366465

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Synopsis

The Windows Defender installation on the remote host is affected by an information disclosure vulnerability.

Description

The Windows Defender installation on the remote host is missing a security update. It is, therefore, affected by an information disclosure vulnerability:

 - Improper link resolution before file access ('link following') in Microsoft Defender allows an authorized attacker to disclose information locally. (CVE-2026-70264)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Microsoft has released a security update, please review the vendor advisory.

See Also

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70264

Plugin Details

Severity: Medium

ID: 366465

File Name: smb_nt_ms26_oct_windows_defender.nasl

Version: 1.1

Type: Local

Agent: windows

Published: 10/16/2026

Updated: 10/16/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.67

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:N/A:N

CVSS Score Source: CVE-2026-70264

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Vulnerability Information

CPE: cpe:/a:microsoft:windows_defender, cpe:/o:microsoft:windows

Required KB Items: SMB/Registry/Enumerated, SMB/svcs

Patch Publication Date: 10/13/2026

Vulnerability Publication Date: 10/13/2026

Reference Information

CVE: CVE-2026-70264

CWE: 59