Detections
Analytics

Security Updates for Microsoft SharePoint Server 2019 (August 2026)

high Nessus Plugin ID 334613

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Synopsis

The Microsoft SharePoint Server 2019 installation on the remote host is affected by multiple vulnerabilities.

Description

The Microsoft SharePoint Server 2019 installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:

 - Improper authentication in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network. (CVE-2026-62827)

 - Missing authentication for critical function in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network. (CVE-2026-64921)

 - Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network. (CVE-2026-65665)

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

Solution

Microsoft has released the following security updates to address this issue:
 - Update to version 16.0.10417.20198

See Also

https://support.microsoft.com/help/5002894

https://support.microsoft.com/help/5002896

Plugin Details

Severity: High

ID: 334613

File Name: smb_nt_ms26_aug_office_sharepoint_2019.nasl

Version: 1.5

Type: Local

Agent: windows

Published: 8/11/2026

Updated: 8/28/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.2

Percentile: 99.76

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 7

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

CVSS Score Source: CVE-2026-65660

CVSS v3

Risk Factor: High

Base Score: 8.7

Temporal Score: 7.8

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

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

CVSS Score Source: CVE-2026-70355

Vulnerability Information

CPE: cpe:/a:microsoft:sharepoint_server:2019

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/11/2026

Vulnerability Publication Date: 8/11/2026

Reference Information

CVE: CVE-2026-57105, CVE-2026-58639, CVE-2026-62827, CVE-2026-62829, CVE-2026-62837, CVE-2026-62839, CVE-2026-62917, CVE-2026-63512, CVE-2026-63514, CVE-2026-63516, CVE-2026-63520, CVE-2026-64897, CVE-2026-64900, CVE-2026-64901, CVE-2026-64902, CVE-2026-64916, CVE-2026-64921, CVE-2026-64922, CVE-2026-65658, CVE-2026-65660, CVE-2026-65663, CVE-2026-65665, CVE-2026-66805, CVE-2026-66808, CVE-2026-70324, CVE-2026-70355

CWE: 20, 23, 287, 306, 502, 522, 79, 863, 918, 94

IAVA: 2026-A-0838

MSFT: MS26-5002894, MS26-5002896

MSKB: 5002894, 5002896