Security Updates for Microsoft SharePoint Server Subscription Edition (January 2026)

critical Nessus Plugin ID 283469

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Synopsis

The Microsoft SharePoint Server Subscription Edition installation on the remote host is missing a security update.

Description

The Microsoft SharePoint Server Subscription Edition 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-2026-20948, 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: Critical

ID: 283469

File Name: smb_nt_ms26_jan_office_sharepoint_subscr.nasl

Version: 1.1

Type: local

Agent: windows

Family: Windows : Microsoft Bulletins

Published: 1/13/2026

Updated: 1/13/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.4

CVSS v2

Risk Factor: Critical

Base Score: 10

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

CVSS Score Source: CVE-2026-20948

CVSS v3

Risk Factor: Critical

Base Score: 9.8

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

Vulnerability Information

CPE: cpe:/a:microsoft:sharepoint_server:subscription

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Patch Publication Date: 1/13/2026

Vulnerability Publication Date: 1/13/2026

Reference Information

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

MSFT: MS26-5002822

MSKB: 5002822

Detections

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