Security Update for Microsoft .NET Core (August 2026)

high Nessus Plugin ID 334610

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Synopsis

The Microsoft .NET Core installations on the remote host are affected by multiple vulnerabilities.

Description

The Microsoft .NET Core installations on the remote host are missing a security update. It is, therefore, affected by multiple vulnerabilities as referenced in the vendor advisory.

- .NET Elevation of Privilege Vulnerability (CVE-2026-58641, CVE-2026-62871, CVE-2026-62886, CVE-2026-62909)

- .NET Security Feature Bypass Vulnerability (CVE-2026-62899)

- .NET Information Disclosure Vulnerability (CVE-2026-62900, CVE-2026-62902)

- .NET Denial of Service Vulnerability (CVE-2026-62901)

- .NET Core Remote Code Execution Vulnerability (CVE-2026-70354)

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

Solution

Update .NET Core, remove vulnerable packages and refer to vendor advisory.

Plugin Details

Severity: High

ID: 334610

File Name: smb_nt_ms26_aug_dotnet_core.nasl

Version: 1.3

Type: Local

Agent: windows

Family: Windows

Published: 8/11/2026

Updated: 8/21/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.82

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2026-70354

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:.net_core

Required KB Items: installed_sw/.NET Core Windows

Exploit Ease: No known exploits are available

Patch Publication Date: 8/11/2026

Vulnerability Publication Date: 8/11/2026

Reference Information

CVE: CVE-2026-58641, CVE-2026-62871, CVE-2026-62886, CVE-2026-62897, CVE-2026-62898, CVE-2026-62899, CVE-2026-62900, CVE-2026-62901, CVE-2026-62902, CVE-2026-62909, CVE-2026-70354

IAVA: 2026-A-0833

Detections

Analytics