Security Updates for Microsoft Office Products (July 2026)

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

include('compat.inc');

if (description)
{
  script_id(326874);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/14");

  script_cve_id(
    "CVE-2026-47290",
    "CVE-2026-50301",
    "CVE-2026-50314",
    "CVE-2026-50467",
    "CVE-2026-50665",
    "CVE-2026-55017",
    "CVE-2026-55018",
    "CVE-2026-55022",
    "CVE-2026-55023",
    "CVE-2026-55026",
    "CVE-2026-55027",
    "CVE-2026-55028",
    "CVE-2026-55035",
    "CVE-2026-55042",
    "CVE-2026-55045",
    "CVE-2026-55047",
    "CVE-2026-55049",
    "CVE-2026-55056",
    "CVE-2026-55057",
    "CVE-2026-55121",
    "CVE-2026-55125",
    "CVE-2026-55129",
    "CVE-2026-55139",
    "CVE-2026-55140",
    "CVE-2026-56192",
    "CVE-2026-56193",
    "CVE-2026-56195"
  );
  script_xref(name:"MSKB", value:"5002887");
  script_xref(name:"MSKB", value:"5002273");
  script_xref(name:"MSKB", value:"5002748");
  script_xref(name:"MSKB", value:"5002830");
  script_xref(name:"MSFT", value:"MS26-5002887");
  script_xref(name:"MSFT", value:"MS26-5002273");
  script_xref(name:"MSFT", value:"MS26-5002748");
  script_xref(name:"MSFT", value:"MS26-5002830");

  script_name(english:"Security Updates for Microsoft Office Products (July 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:

  - Out-of-bounds read in Microsoft Office allows an unauthorized attacker to execute code locally.
    (CVE-2026-55045)

  - Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code
    locally. (CVE-2026-50301, CVE-2026-55017, CVE-2026-55049, CVE-2026-55056, CVE-2026-55125,
    CVE-2026-55129, CVE-2026-55140)

  - Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
    (CVE-2026-47290, CVE-2026-50314, CVE-2026-50467, CVE-2026-55018)

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/5002887");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5002273");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5002748");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5002830");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following updates to address these issues:
  - KB5002887
  - KB5002273
  - KB5002748
  - KB5002830");
  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:N/S:U/C:H/I:H/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-50301");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-55045");

  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:"2026/07/14");

  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 = 'MS26-07';
var kbs = ['5002887', '5002273', '5002748', '5002830'];
var severity = SECURITY_HOLE;

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

# oart.dll (KB5002748) has a different fixed version per Office bitness:
# x86 = 16.0.5504.1000, x64 = 16.0.5561.1000. The office VCF has no per-arch
# constraint support, so resolve the version here. Default to the lower (x86)
# value and only bump to the x64 value when 64-bit Office is detected; this
# fails safe (unknown bitness -> lower value, avoiding false positives).
var oart_fixed_version = '16.0.5504.1000';
if ('64' >< get_kb_item('SMB/Office/16.0/Bitness'))
  oart_fixed_version = '16.0.5561.1000';

var constraints = [
  {'product' : 'Microsoft Office 2016', 'kb':'5002887', 'file':'mso.dll',   'fixed_version': '16.0.5561.1000'},
  {'product' : 'Microsoft Office 2016', 'kb':'5002273', 'file':'vbe7.dll',  'fixed_version': '7.1.11.58'},
  {'product' : 'Microsoft Office 2016', 'kb':'5002748', 'file':'oart.dll',  'fixed_version': oart_fixed_version},
  {'product' : 'Microsoft Office 2016', 'kb':'5002830', 'file':'graph.exe', 'fixed_version': '16.0.5561.1001'}
];

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