Kibana 9.0.x < 9.4.7 / 9.5.x < 9.5.4 Incorrect Authorization (ESA-2026-187)

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

include('compat.inc');

if (description)
{
  script_id(363428);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/06");

  script_cve_id("CVE-2026-102406");

  script_name(english:"Kibana 9.0.x < 9.4.7 / 9.5.x < 9.5.4 Incorrect Authorization (ESA-2026-187)");

  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 9.0.x prior to 9.4.7, or 9.5.x prior to 9.5.4. It is, therefore,
affected by a vulnerability as referenced in the ESA-2026-187 advisory.

  - Authorization Bypass Through User-Controlled Key (CWE-639) in Kibana could lead to cross-tenant data
    interception. In this context, tenant refers to a user or team sharing the same Kibana deployment, not a
    separate Elastic Cloud organization or customer. Kibana's Fleet package installation process allowed a
    user holding delegated Fleet package-management privileges, without direct Elasticsearch administrative
    privileges, to claim a data stream identifier already in use by another tenant. Because ownership of that
    identifier was not verified before Fleet applied the uploaded package's generated index and ingest-
    pipeline settings to already-existing infrastructure, an attacker could redirect an existing tenant's data
    stream through infrastructure under their control. This exposed the affected tenant's subsequently
    ingested data to unauthorized disclosure and modification, and prevented that data from reaching its
    intended destination. Interception could continue even after the malicious package was removed, requiring
    separate remediation of the affected infrastructure. (CVE-2026-102406)

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/390860");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Kibana version 9.4.7, or 9.5.4 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:C");
  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:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-102406");

  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:"2026/10/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/06");

  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_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' : '9.0.0', 'fixed_version' : '9.4.7' },
  { 'min_version' : '9.5.0', 'fixed_version' : '9.5.4' }
];

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