Security Updates for Microsoft SharePoint Server 2016 (January 2026)

medium Nessus Plugin ID 283468

Language:

Synopsis

The Microsoft SharePoint Server 2016 installation on the remote host is affected by multiple vulnerabilities.

Description

The Microsoft SharePoint Server 2016 installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:

- A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2026-20947, CVE-2026-20948, CVE-2026-62551, CVE-2026-62563)

- A session spoofing vulnerability exists. An attacker can exploit this to perform actions with the privileges of another user. (CVE-2026-20958)

- A information disclosure vulnerability exists. An authorized attacker could use this to disclose information over a network (CVE-2026-20959)

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 security updates to address this issue.

Plugin Details

Severity: Medium

ID: 283468

File Name: smb_nt_ms26_jan_office_sharepoint_2016.nasl

Version: 1.5

Type: local

Agent: windows

Family: Windows : Microsoft Bulletins

Published: 1/13/2026

Updated: 3/18/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.4

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-20947

CVSS v3

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 5

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

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

CVSS Score Source: CVE-2026-20959

Vulnerability Information

CPE: cpe:/a:microsoft:sharepoint_server:2016

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/13/2026

Vulnerability Publication Date: 1/13/2026

CISA Known Exploited Vulnerability Due Dates: 3/21/2026

Reference Information

CVE: CVE-2026-20943, CVE-2026-20947, CVE-2026-20948, CVE-2026-20951, CVE-2026-20958, CVE-2026-20959, CVE-2026-20963

IAVA: 2026-A-0043-S

MSFT: MS26-5002828

MSKB: 5002828

Detections

Analytics