Detections
Analytics

Security Updates for Microsoft SharePoint Server 2016 (July 2026)

critical Nessus Plugin ID 327611

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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:

 - Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network. (CVE-2026-50522)

 - External control of file name or path in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network. (CVE-2026-54108)

 - Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network. (CVE-2026-55016)

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 16.0.5561.1001

See Also

https://support.microsoft.com/help/5002891

https://support.microsoft.com/help/5002892

Plugin Details

Severity: Critical

ID: 327611

File Name: smb_nt_ms26_jul_office_sharepoint_2016.nasl

Version: 1.4

Type: Local

Agent: windows

Published: 7/17/2026

Updated: 7/23/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.5

Percentile: 99.86

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.3

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

CVSS Score Source: CVE-2026-56164

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

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

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

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: 7/14/2026

Vulnerability Publication Date: 7/14/2026

CISA Known Exploited Vulnerability Due Dates: 7/17/2026, 7/25/2026

Reference Information

CVE: CVE-2026-50522, CVE-2026-54108, CVE-2026-55016, CVE-2026-55019, CVE-2026-55020, CVE-2026-55021, CVE-2026-55023, CVE-2026-55026, CVE-2026-55027, CVE-2026-55028, CVE-2026-55030, CVE-2026-55032, CVE-2026-55033, CVE-2026-55034, CVE-2026-55035, CVE-2026-55038, CVE-2026-55040, CVE-2026-55045, CVE-2026-55047, CVE-2026-55050, CVE-2026-55051, CVE-2026-55052, CVE-2026-55055, CVE-2026-55121, CVE-2026-55124, CVE-2026-55125, CVE-2026-55126, CVE-2026-55127, CVE-2026-55128, CVE-2026-55130, CVE-2026-55132, CVE-2026-55134, CVE-2026-55135, CVE-2026-55142, CVE-2026-56157, CVE-2026-56164, CVE-2026-56192, CVE-2026-58277

CWE: 121, 122, 125, 1287, 1390, 190, 197, 20, 284, 285, 306, 415, 416, 502, 73, 79, 862, 918

IAVA: 2026-A-0730

MSFT: MS26-5002891, MS26-5002892

MSKB: 5002891, 5002892