Security Updates for Microsoft Excel Products (January 2026)

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

include('compat.inc');

if (description)
{
  script_id(283477);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/24");

  script_cve_id("CVE-2026-20946", "CVE-2026-20950", "CVE-2026-20957");
  script_xref(name:"MSKB", value:"5002831");
  script_xref(name:"MSFT", value:"MS26-5002831");
  script_xref(name:"IAVA", value:"2026-A-0041-S");

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

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Excel Products are missing a security update.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Excel Products are missing a security update. They are, therefore, affected by multiple remote code
execution vulnerabilities. An attacker can exploit these to bypass authentication and execute unauthorized arbitrary
commands. (CVE-2026-20946, CVE-2026-20950, CVE-2026-20957)

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/5002831");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released KB5002831 to address this issue.");
  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-2026-20957");

  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:"2026/01/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/01/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/01/13");

  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 : 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", "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 = 'MS26-01';
var kbs = make_list(
  '5002831'
);

var constraints = [
  { 'kb':'5002831', 'channel':'MSI', 'fixed_version': '16.0.5535.1000', 'sp' : 0}
];

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