Kibana 9.4.x < 9.4.7 Privilege Escalation (ESA-2026-85)

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

include('compat.inc');

if (description)
{
  script_id(351485);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/02");

  script_cve_id("CVE-2026-72668");
  script_xref(name:"IAVB", value:"2026-B-0277");

  script_name(english:"Kibana 9.4.x < 9.4.7 Privilege Escalation (ESA-2026-85)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by a privilege escalation vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Kibana installed on the remote host is 9.4.x prior to 9.4.7. It is, therefore, affected by a
vulnerability as referenced in the ESA-2026-85 advisory.

  - Unintended Proxy or Intermediary ('Confused Deputy') (CWE-441) in Kibana Agent Builder can lead to
    privilege escalation. A non-administrative user able to edit a shared agent could cause privileged
    operations to be carried out under the identity of a higher-privileged user who subsequently interacts
    with that agent. Where the same user can also author workflows, this can extend to full administrative
    control of Kibana and of the Elasticsearch cluster. (CVE-2026-72668)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://discuss.elastic.co/t/390678");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Kibana version 9.4.7 or later as appropriate for your release branch.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/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:R/S:U/C:H/I:H/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-2026-72668");

  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:"2026/09/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/30");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:elasticsearch:kibana");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  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('vcf.inc');
include('http.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' : '9.4.0', 'fixed_version' : '9.4.7' }
];

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