Kibana 8.x < 8.19.16 / 9.0.x < 9.3.5 / 9.4.x < 9.4.2 Multiple Vulnerabilities (ESA-2026-35 / ESA-2026-38)

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

include('compat.inc');

if (description)
{
  script_id(318724);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/05");

  script_cve_id("CVE-2026-42400", "CVE-2026-49095");
  script_xref(name:"IAVB", value:"2026-B-0141");

  script_name(english:"Kibana 8.x < 8.19.16 / 9.0.x < 9.3.5 / 9.4.x < 9.4.2 Multiple Vulnerabilities (ESA-2026-35 / ESA-2026-38)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Kibana installed on the remote host is prior to 8.19.16, 9.3.5, or 9.4.2. It is, therefore, affected
by multiple vulnerabilities as referenced in the ESA-2026-35 and ESA-2026-38 advisories.

  - Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive
    Allocation (CAPEC-130). An authenticated user can send a specially crafted compressed request payload that
    is processed prior to authorization checks, causing excessive memory and CPU resource consumption that can
    result in a Kibana instance becoming unresponsive or crashing. (CVE-2026-42400)

  - Improper Input Validation (CWE-20) in the Kibana Fleet agent policy management feature can lead to
    privilege escalation. An authenticated user with Fleet management privileges can manipulate agent policy
    configuration by injecting values into a configuration override mechanism that is not adequately
    validated. An attacker can cause Elastic Agents to be issued API keys with elevated Elasticsearch
    privileges, potentially granting unauthorized read and write access to sensitive Elasticsearch security
    indices beyond what is intended for the Fleet management role. (CVE-2026-49095)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported
version number.");
  # https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-9-4-2-security-update-esa-2026-35/386554
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?05aa20fa");
  # https://discuss.elastic.co/t/kibana-fleet-8-19-16-9-3-5-and-9-4-2-security-update-esa-2026-38/386559
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?fc842b61");
  script_set_attribute(attribute:"solution", value:
"Update to Kibana version 8.19.16, 9.3.5, 9.4.2 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:M/C:C/I:C/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-49095");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/04");

  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' : '8.19.16' },
  { 'min_version' : '9.0.0', 'fixed_version' : '9.3.5' },
  { 'min_version' : '9.4.0', 'fixed_version' : '9.4.2' }
];

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