Kibana 9.2.x < 9.4.5 Incorrect Authorization (ESA-2026-82)

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

include('compat.inc');

if (description)
{
  script_id(338728);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/21");

  script_cve_id("CVE-2026-72680");
  script_xref(name:"IAVB", value:"2026-B-0232");

  script_name(english:"Kibana 9.2.x < 9.4.5 Incorrect Authorization (ESA-2026-82)");

  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 9.2.x prior to 9.4.5. It is, therefore, affected by a
vulnerability as referenced in the ESA-2026-82 advisory.

  - Kibana Agent Builder A2A JSON-RPC API endpoint derives the identifier of a stored conversation from a
    user-supplied input, and the ownership check on that identifier does not distinguish between a conversation
    that does not exist and one that exists but belongs to another user. As a result, an authenticated user
    holding only the Agent Builder read privilege can supply an identifier already in use by another user in the
    same space and cause that user's conversation to be replaced and reassigned to the requesting account. The
    original owner permanently loses access to the conversation and its history. (CVE-2026-72680)

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-9-4-5-security-update-esa-2026-82/389535
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5640414a");
  script_set_attribute(attribute:"solution", value:
"Update to Kibana version 9.4.5 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:C/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-72680");

  script_cwe_id(639);

  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' : '9.2.0', 'fixed_version' : '9.4.5' }
];

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