Security Updates for Microsoft SharePoint Server 2019 (August 2026)

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

include('compat.inc');

if (description)
{
  script_id(334613);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/14");

  script_cve_id(
    "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"
  );
  script_xref(name:"MSKB", value:"5002894");
  script_xref(name:"MSKB", value:"5002896");
  script_xref(name:"MSFT", value:"MS26-5002894");
  script_xref(name:"MSFT", value:"MS26-5002896");
  script_xref(name:"IAVA", value:"2026-A-0838");

  script_name(english:"Security Updates for Microsoft SharePoint Server 2019 (August 2026)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft SharePoint Server 2019 installation on the remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"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.");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5002894");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5002896");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:
  - Update to version 16.0.10417.20198");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-65665");
  script_cwe_id(20, 23, 79, 94, 287, 306, 502, 522, 863, 918);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:sharepoint_server:2019");
  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'      : '2019',
    'edition'      : 'Server',
    'kb'           : '5002894',
    'path'         : app_info.path,
    'version'      : '16.0.10417.20198',
    'append'       : 'bin',
    'file'         : 'ascalc.dll',
    'product_name' : 'Microsoft SharePoint Enterprise Server 2019'
  }
];
vcf::microsoft::sharepoint::check_version_and_report
(
  app_info:app_info, 
  bulletin:'MS26-08',
  constraints:kb_checks, 
  severity:SECURITY_HOLE
);