Microsoft Windows Notepad < 11.2510 Command Injection (February 2026)

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

include('compat.inc');

if (description)
{
  script_id(298646);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/24");

  script_cve_id("CVE-2026-20841");
  script_xref(name:"IAVA", value:"2026-A-0114");

  script_name(english:"Microsoft Windows Notepad < 11.2510 Command Injection (February 2026)");

  script_set_attribute(attribute:"synopsis", value:
"The Windows app installed on the remote host is affected by a command injection vulnerability.");
  script_set_attribute(attribute:"description", value:
"The Windows 'Microsoft Windows Notepad' app installed on the remote host is prior to version
11.2510. It is, therefore, affected by a command injection vulnerability:

  - Improper neutralization of special elements used in a command allows an unauthorized
    attacker to execute code over a network. (CVE-2026-20841)

Note that Nessus has not tested for this issue but has instead relied only on the application's
self-reported version number.");
  script_set_attribute(attribute:"see_also", value:"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20841");
  script_set_attribute(attribute:"solution", value:
"Upgrade to app version 11.2510 or later via the Microsoft Store.");
  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:F/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:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-20841");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/02/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/02/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/02/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:microsoft:windows");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/a:microsoft:windows_notepad");
  script_set_attribute(attribute:"stig_severity", value:"II");
  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("smb_hotfixes.nasl", "wmi_enum_windows_app_store.nbin");
  script_require_keys("SMB/Registry/Enumerated", "WMI/Windows App Store/Enumerated");
  script_require_ports(139, 445);

  exit(0);
}

include('vcf.inc');
include('vcf_extras.inc');

var app = 'Microsoft.WindowsNotepad';

var app_info = vcf::microsoft_appstore::get_app_info(app:app);

if (empty_or_null(app_info))
  audit(AUDIT_NOT_INST, app);

vcf::check_granularity(app_info:app_info, sig_segments:2);

var constraints = [
  { 'fixed_version' : '11.2510' }
];

vcf::microsoft_appstore::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);