Kibana 8.x < 8.19.21 / 9.0.3 < 9.4.6 Missing Authorization (ESA-2026-155)

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

include('compat.inc');

if (description)
{
  script_id(344302);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/10");

  script_cve_id("CVE-2026-78597");
  script_xref(name:"IAVB", value:"2026-B-0244");

  script_name(english:"Kibana 8.x < 8.19.21 / 9.0.3 < 9.4.6 Missing Authorization (ESA-2026-155)");

  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.x prior to 8.19.21, or 9.0.3 prior to 9.4.6. It is, therefore,
affected by a vulnerability as referenced in the ESA-2026-155 advisory.

  - Missing Authorization (CWE-862) in the Kibana Entity Store feature can lead to unauthorized credential
    creation via Accessing Functionality Not Properly Constrained by ACLs (CAPEC-1). An authenticated user
    holding only low-privilege Security feature access could invoke an administrative operation that creates and
    persists Elasticsearch API keys under the caller's identity, bypassing the elevated cluster and Kibana
    privileges that the documented Entity Store setup flow requires. (CVE-2026-78597)

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-8-19-21-9-4-6-security-update-esa-2026-155/390072
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f2d2d838");
  script_set_attribute(attribute:"solution", value:
"Update to Kibana version 8.19.21, 9.4.6 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-78597");

  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:"2026/09/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/09");

  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' : '8.19.21' },
  { 'min_version' : '9.0.3', 'fixed_version' : '9.4.6' }
];

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