Security Updates for Microsoft Excel Products C2R (June 2026)

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

include('compat.inc');

if (description)
{
  script_id(320865);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/22");

  script_cve_id(
    "CVE-2026-44817",
    "CVE-2026-44818",
    "CVE-2026-44820",
    "CVE-2026-44822",
    "CVE-2026-44823",
    "CVE-2026-45455",
    "CVE-2026-45459",
    "CVE-2026-45469"
  );
  script_xref(name:"IAVA", value:"2026-A-0570");
  script_xref(name:"IAVA", value:"2026-A-0571");

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

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

  - Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to
    execute code locally. (CVE-2026-44817, CVE-2026-44818, CVE-2026-44820, CVE-2026-44823, CVE-2026-45469)

  - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information
    over a network. (CVE-2026-44822, CVE-2026-45455)

  - Protection mechanism failure in Microsoft Office Excel allows an unauthorized attacker to bypass a
    security feature locally. (CVE-2026-45459)

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:N/AC:L/Au:N/C:C/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-44822");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-45455");

  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:excel");
  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", "microsoft_office_compatibility_pack_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_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:'Excel'
);