Kibana 8.x < 8.19.20 / 9.x < 9.4.4 Incorrect Authorization (ESA-2026-90)

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

include('compat.inc');

if (description)
{
  script_id(338727);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/21");

  script_cve_id("CVE-2026-72673");
  script_xref(name:"IAVB", value:"2026-B-0232");

  script_name(english:"Kibana 8.x < 8.19.20 / 9.x < 9.4.4 Incorrect Authorization (ESA-2026-90)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by an incorrect authorization vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Kibana installed on the remote host is 8.x prior to 8.19.20, or 9.x prior to 9.4.4. It is, therefore,
affected by a vulnerability as referenced in the ESA-2026-90 advisory.

  - Incorrect Authorization (CWE-863) in Kibana can lead to unauthorized deletion of Synthetics private
    locations via Accessing Functionality Not Properly Constrained by ACLs (CAPEC-1). Synthetics private
    locations can be shared with more than one space, and deleting one removes it from every space it is shared
    with. The safeguard that prevented the deletion of a private location still in use evaluated only the
    monitors visible in the requesting user's own space, so monitors that depend on the private location in
    other spaces were not taken into account. As a result, an authenticated Kibana user holding the Synthetics
    write privilege in a single space could delete a private location that other spaces still depend on, even
    where the user has no access to those spaces. (CVE-2026-72673)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported
version number.");
  # https://discuss.elastic.co/t/kibana-8-19-20-and-9-4-4-security-update-esa-2026-90/389518
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?559b7c63");
  script_set_attribute(attribute:"solution", value:
"Update to Kibana version 8.19.20, 9.4.4 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-72673");

  script_cwe_id(863);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/21");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:elasticsearch:kibana");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("kibana_web_detect.nbin");
  script_require_keys("installed_sw/Kibana");
  script_require_ports("Services/www", 5601);

  exit(0);
}

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

var app = 'Kibana';

get_install_count(app_name:app, exit_if_zero:TRUE);

var port = get_http_port(default:5601);

var app_info = vcf::get_app_info(app:app, port:port, webapp:TRUE);

var constraints = [
  { 'min_version' : '8.0.0', 'fixed_version' : '8.19.20' },
  { 'min_version' : '9.0.0', 'fixed_version' : '9.4.4' }
];

vcf::check_version_and_report(
  app_info:app_info,
  constraints:constraints,
  severity:SECURITY_WARNING
);