Security Update for Microsoft ASP.NET Core (October 2026)

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

include('compat.inc');

if (description)
{
  script_id(366548);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/16");

  script_cve_id(
    "CVE-2026-70159",
    "CVE-2026-70175",
    "CVE-2026-70179",
    "CVE-2026-70181",
    "CVE-2026-70183",
    "CVE-2026-70186",
    "CVE-2026-70188",
    "CVE-2026-70196",
    "CVE-2026-88092",
    "CVE-2026-92707",
    "CVE-2026-96230",
    "CVE-2026-96236"
  );
  script_xref(name:"IAVA", value:"2026-A-1124");

  script_name(english:"Security Update for Microsoft ASP.NET Core (October 2026)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft ASP.NET installations on the remote host are affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft ASP.NET installations on the remote host are missing a security update. It is, therefore, affected by
multiple vulnerabilities as referenced in the vendor advisory.

  - Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an
    unauthorized attacker to bypass a security feature over a network. (CVE-2026-70188)

  - Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an
    unauthorized attacker to perform tampering over a network. (CVE-2026-88092)

  - Improper neutralization of input during web page generation ('cross-site scripting') in ASP.NET Core allows
    an unauthorized attacker to execute code over a network. (CVE-2026-96230)

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://github.com/dotnet/announcements/issues/452");
  script_set_attribute(attribute:"see_also", value:"https://github.com/dotnet/announcements/issues/457");
  script_set_attribute(attribute:"see_also", value:"https://github.com/dotnet/announcements/issues/458");
  script_set_attribute(attribute:"see_also", value:"https://github.com/dotnet/announcements/issues/459");
  script_set_attribute(attribute:"see_also", value:"https://github.com/dotnet/announcements/issues/460");
  script_set_attribute(attribute:"see_also", value:"https://github.com/dotnet/announcements/issues/461");
  script_set_attribute(attribute:"see_also", value:"https://github.com/dotnet/announcements/issues/462");
  script_set_attribute(attribute:"see_also", value:"https://github.com/dotnet/announcements/issues/465");
  script_set_attribute(attribute:"see_also", value:"https://github.com/dotnet/announcements/issues/472");
  script_set_attribute(attribute:"see_also", value:"https://github.com/dotnet/announcements/issues/473");
  script_set_attribute(attribute:"see_also", value:"https://github.com/dotnet/announcements/issues/478");
  script_set_attribute(attribute:"see_also", value:"https://github.com/dotnet/announcements/issues/484");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5130034");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5130035");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5130036");
  script_set_attribute(attribute:"see_also", value:"https://dotnet.microsoft.com/download/dotnet/8.0");
  # https://github.com/dotnet/core/blob/main/release-notes/8.0/8.0.32/8.0.32.md
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f66fd547");
  script_set_attribute(attribute:"see_also", value:"https://dotnet.microsoft.com/download/dotnet/9.0");
  # https://github.com/dotnet/core/blob/main/release-notes/9.0/9.0.21/9.0.21.md
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?399b6da0");
  script_set_attribute(attribute:"see_also", value:"https://dotnet.microsoft.com/download/dotnet/10.0");
  # https://github.com/dotnet/core/blob/main/release-notes/10.0/10.0.13/10.0.13.md
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4756b61b");
  script_set_attribute(attribute:"solution", value:
"Update ASP.NET Core, remove vulnerable packages and refer to vendor advisory.");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-105016");

  script_cwe_id(79, 290, 362, 407, 444, 640, 770, 833, 1325);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/10/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/16");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:asp.net_core");
  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("microsoft_asp_dotnet_core_win.nbin");
  script_require_keys("SMB/Registry/Enumerated", "installed_sw/ASP .NET Core Windows");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'requires': [{'scope': 'target', 'match': {'os': 'windows'}}],
  'checks': [{
    'product': {'name': 'ASP .NET Core Windows', 'type': 'app'},
    'check_algorithm': 'default',
    'constraints': [{
      'min_version': '8',
      'fixed_version': '8.0.32'
    },{
      'min_version': '9',
      'fixed_version': '9.0.21'
    },{
      'min_version': '10',
      'fixed_version': '10.0.13'
    }]
  }]
};

var result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_HOLE);
vdf::handle_check_and_report_errors(vdf_result:result);