Kibana 8.19.11 < 8.19.21 / 9.3.x < 9.4.6 / 9.5.x < 9.5.2 Incorrect Authorization (ESA-2026-142)

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

include('compat.inc');

if (description)
{
  script_id(344309);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/10");

  script_cve_id("CVE-2026-78606");
  script_xref(name:"IAVB", value:"2026-B-0244");

  script_name(english:"Kibana 8.19.11 < 8.19.21 / 9.3.x < 9.4.6 / 9.5.x < 9.5.2 Incorrect Authorization (ESA-2026-142)");

  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 8.19.11 prior to 8.19.21, or 9.3.x prior to 9.4.6, or 9.5.x prior
to 9.5.2. It is, therefore, affected by a vulnerability as referenced in the ESA-2026-142 advisory.

  - Incorrect Authorization (CWE-863) in Kibana can lead to unauthorized disclosure, modification, and deletion
    of data via Accessing Functionality Not Properly Constrained by ACLs (CAPEC-1). Where two authenticated
    principals originating from different authentication realms share the same username value, one could read,
    modify, and delete the other's private Elastic AI Assistant Knowledge Base entries. (CVE-2026-78606)

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-8-19-21-9-4-6-9-5-2-security-update-esa-2026-142/390093
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?fa5a6224");
  script_set_attribute(attribute:"solution", value:
"Update to Kibana version 8.19.21, 9.4.6, 9.5.2 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:S/C:P/I:P/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:H/PR:L/UI:N/S:U/C:L/I:L/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-2026-78606");

  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' : '8.19.11', 'fixed_version' : '8.19.21' },
  { 'min_version' : '9.3.0', 'fixed_version' : '9.4.6' },
  { 'min_version' : '9.5.0', 'fixed_version' : '9.5.2' }
];

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