Security Updates for Microsoft Word Products C2R (June 2026)

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

include('compat.inc');

if (description)
{
  script_id(320864);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/15");

  script_cve_id(
    "CVE-2026-45456",
    "CVE-2026-45457",
    "CVE-2026-45458",
    "CVE-2026-45466",
    "CVE-2026-45471",
    "CVE-2026-45486",
    "CVE-2026-45643"
  );
  script_xref(name:"IAVA", value:"2026-A-0570");
  script_xref(name:"IAVA", value:"2026-A-0576");

  script_name(english:"Security Updates for Microsoft Word Products C2R (June 2026)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Word Products are affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Word Products are missing security updates. It is, therefore, affected by multiple vulnerabilities:

  - Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized
    attacker to execute code locally. (CVE-2026-45456, CVE-2026-45458)

  - Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code
    locally. (CVE-2026-45457, CVE-2026-45471, CVE-2026-45486, CVE-2026-45643)

  - Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to disclose
    information locally. (CVE-2026-45466)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5931548c");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released patches to address these issues.

For Office 365, Office 2016 C2R, or Office 2019, 2021 or 2024,
ensure automatic updates are enabled or open any office app
and manually perform an update.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC: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_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-45643");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-45458");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/12");

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

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

  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 = 'MS26-06';

var constraints = [
  {'fixed_version':'16.0.20026.20168','channel':'Current'},
  {'fixed_version':'16.0.20026.20166','channel':'Enterprise Deferred','channel_version':'2605'},
  {'fixed_version':'16.0.19929.20220','channel':'Enterprise Deferred','channel_version':'2604'},
  {'fixed_version':'16.0.19822.20288','channel':'Enterprise Deferred'},
  {'fixed_version':'16.0.19127.20678','channel':'Deferred'},
  {'fixed_version':'16.0.20026.20168','channel':'2024 Retail'},
  {'fixed_version':'16.0.20026.20168','channel':'2021 Retail'},
  {'fixed_version':'16.0.17932.20842','channel':'LTSC 2024'},
  {'fixed_version':'16.0.14334.20756','channel':'LTSC 2021'},
  {'fixed_version':'16.0.10417.20153','channel':'2019 Volume'}
];

vcf::microsoft::office_product::check_version_and_report(
  constraints:constraints,
  severity:SECURITY_HOLE,
  bulletin:bulletin,
  subproduct:'Word'
);