Security Updates for Microsoft SharePoint Server 2016 (July 2026)

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#

include('compat.inc');

if (description)
{
  script_id(327611);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/20");

  script_cve_id(
    "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"
  );
  script_xref(name:"MSKB", value:"5002891");
  script_xref(name:"MSKB", value:"5002892");
  script_xref(name:"MSFT", value:"MS26-5002891");
  script_xref(name:"MSFT", value:"MS26-5002892");
  script_xref(name:"IAVA", value:"2026-A-0730");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2026/07/17");

  script_name(english:"Security Updates for Microsoft SharePoint Server 2016 (July 2026)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft SharePoint Server 2016 installation on the remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"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.");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5002891");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5002892");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:
    - Update to version 16.0.5561.1001");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-56164");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(20, 73, 79, 121, 122, 125, 190, 197, 284, 285, 306, 415, 416, 502, 862, 918, 1287, 1390);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/07/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/17");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:sharepoint_server:2016");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows : Microsoft Bulletins");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("microsoft_sharepoint_installed.nbin", "smb_hotfixes.nasl", "ms_bulletin_checks_possible.nasl");
  script_require_keys("SMB/MS_Bulletin_Checks/Possible");
  script_require_ports(139, 445, "Host/patch_management_checks");

  exit(0);
}

include('vcf_extras_microsoft.inc');

var app_info = vcf::microsoft::sharepoint::get_app_info();
var kb_checks = 
[
  {
    'product'      : '2016',
    'edition'      : 'Server',
    'kb'           : '5002891',
    'path'         : app_info.path,
    'version'      : '16.0.5561.1001',
    'append'       : 'webservices\\conversionservices',
    'file'         : 'sword.dll',
    'product_name' : 'Microsoft Sharepoint Enterprise Server 2016 SP1' 
  }
];
vcf::microsoft::sharepoint::check_version_and_report
(
  app_info:app_info, 
  bulletin:'MS26-07',
  constraints:kb_checks, 
  severity:SECURITY_HOLE
);