Security Updates for Microsoft Word Products C2R (August 2026)

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

include('compat.inc');

if (description)
{
  script_id(335111);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/14");

  script_cve_id(
    "CVE-2026-58651",
    "CVE-2026-63521",
    "CVE-2026-63525",
    "CVE-2026-63527",
    "CVE-2026-63528",
    "CVE-2026-63530",
    "CVE-2026-63531",
    "CVE-2026-64905",
    "CVE-2026-64907",
    "CVE-2026-64915",
    "CVE-2026-64917",
    "CVE-2026-66806",
    "CVE-2026-66809",
    "CVE-2026-66810",
    "CVE-2026-70310",
    "CVE-2026-70311",
    "CVE-2026-70318"
  );

  script_name(english:"Security Updates for Microsoft Word Products C2R (August 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:

  - Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.
    (CVE-2026-58651, CVE-2026-64915)

  - Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code
    locally. (CVE-2026-63527, CVE-2026-64907)

  - Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information
    locally. (CVE-2026-63521, CVE-2026-63528, CVE-2026-63530, CVE-2026-63531, CVE-2026-64917, CVE-2026-70310)

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, 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:R/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-2026-70311");

  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:"2026/08/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:word");
  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 = 'MS26-08';

var constraints = [
  {'fixed_version':'16.0.20228.20190','channel':'Current'},
  {'fixed_version':'16.0.20228.20188','channel':'Enterprise Deferred','channel_version':'2607'},
  {'fixed_version':'16.0.20131.20206','channel':'Enterprise Deferred','channel_version':'2606'},
  {'fixed_version':'16.0.20026.20266','channel':'Enterprise Deferred'},
  {'fixed_version':'16.0.20228.20186','channel':'First Release for Deferred'},
  {'fixed_version':'16.0.19127.20730','channel':'Deferred'},
  {'fixed_version':'16.0.20228.20190','channel':'2024 Retail'},
  {'fixed_version':'16.0.20228.20190','channel':'2021 Retail'},
  {'fixed_version':'16.0.17932.20910','channel':'LTSC 2024'},
  {'fixed_version':'16.0.14334.20848','channel':'LTSC 2021'},
  {'fixed_version':'16.0.10417.20197','channel':'2019 Volume'}
];

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