Security Updates for Microsoft Office Products (August 2026)

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

include('compat.inc');

if (description)
{
  script_id(334616);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/11");

  script_cve_id(
    "CVE-2026-63513",
    "CVE-2026-63515",
    "CVE-2026-63517",
    "CVE-2026-63524",
    "CVE-2026-63526",
    "CVE-2026-63529",
    "CVE-2026-63532",
    "CVE-2026-63533",
    "CVE-2026-64899",
    "CVE-2026-64903",
    "CVE-2026-64909",
    "CVE-2026-65661",
    "CVE-2026-70317"
  );
  script_xref(name:"MSKB", value:"5002791");
  script_xref(name:"MSKB", value:"5002795");
  script_xref(name:"MSKB", value:"5002897");
  script_xref(name:"MSKB", value:"5002900");
  script_xref(name:"MSKB", value:"5002902");
  script_xref(name:"MSFT", value:"MS26-5002791");
  script_xref(name:"MSFT", value:"MS26-5002795");
  script_xref(name:"MSFT", value:"MS26-5002897");
  script_xref(name:"MSFT", value:"MS26-5002900");
  script_xref(name:"MSFT", value:"MS26-5002902");

  script_name(english:"Security Updates for Microsoft Office Products (August 2026)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Office Products are affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Office Products are missing a security update. They are, therefore, affected by multiple
vulnerabilities:

  - Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code
    locally. (CVE-2026-63513, CVE-2026-63533, CVE-2026-65661)

  - Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to execute code
    locally. (CVE-2026-63532, CVE-2026-64903)

  - Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information
    locally. (CVE-2026-63517, CVE-2026-63524, CVE-2026-63529, CVE-2026-64899)

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/en-us/help/5002791");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5002795");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5002897");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5002900");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5002902");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:
  - KB5002791
  - KB5002795
  - KB5002897
  - KB5002900
  - KB5002902");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-65661");

  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:office");
  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("office_installed.nasl", "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_office.inc');

var bulletin = 'MS26-08';
var kbs = ['5002897', '5002902', '5002791', '5002795', '5002900'];

var app_info = vcf::microsoft::office::get_app_info(app:'Microsoft Office', kbs:kbs, bulletin:bulletin, severity:SECURITY_HOLE);

var constraints = [
  {'product' : 'Microsoft Office 2016', 'kb':'5002897', 'file':'mso.dll',                 'fixed_version': '16.0.5565.1001'},
  {'product' : 'Microsoft Office 2016', 'kb':'5002902', 'file':'graph.exe',               'fixed_version': '16.0.5565.1001'},
  {'product' : 'Microsoft Office 2016', 'kb':'5002791', 'file':'mso40uiwin32client.dll',  'fixed_version': '16.0.5565.1000'},
  {'product' : 'Microsoft Office 2016', 'kb':'5002795', 'file':'mso99lwin32client.dll',   'fixed_version': '16.0.5556.1000'},
  {'product' : 'Microsoft Office 2016', 'kb':'5002900', 'file':'vbe7.dll',                'fixed_version': '7.1.11.58'}
];

vcf::microsoft::office::check_version_and_report(
  app_info:app_info,
  constraints:constraints,
  severity:SECURITY_HOLE,
  bulletin:bulletin,
  subproduct:'Office'
);