Kibana 8.9.x < 8.19.19 / 9.x < 9.4.5 Missing Authorization (ESA-2026-86)

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

include('compat.inc');

if (description)
{
  script_id(338732);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/21");

  script_cve_id("CVE-2026-72669");
  script_xref(name:"IAVB", value:"2026-B-0232");

  script_name(english:"Kibana 8.9.x < 8.19.19 / 9.x < 9.4.5 Missing Authorization (ESA-2026-86)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by a missing authorization vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Kibana installed on the remote host is 8.9.x prior to 8.19.19, or 9.x prior to 9.4.5. It is,
therefore, affected by a vulnerability as referenced in the ESA-2026-86 advisory.

  - The state that Kibana stores for an Observability Onboarding flow is not bound to the user who created the
    flow, and the routes that read and update that state do not verify ownership. An authenticated user who
    holds only generic read access to the space can therefore discover the onboarding flows of other users,
    read their onboarding state, and write arbitrary progress data into them. A tampered flow can also cause
    the owner's onboarding view to fail with a server error. (CVE-2026-72669)

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-8-19-19-and-9-4-5-security-update-esa-2026-86/389515
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?aa277c14");
  script_set_attribute(attribute:"solution", value:
"Update to Kibana version 8.19.19, 9.4.5 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:C/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-72669");

  script_cwe_id(862);

  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' : '8.9.0', 'fixed_version' : '8.19.19' },
  { 'min_version' : '9.0.0', 'fixed_version' : '9.4.5' }
];

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