Kibana 8.x < 8.16.3 / 8.17.x < 8.17.2 Authorization Bypass (ESA-2026-51)

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

include('compat.inc');

if (description)
{
  script_id(326283);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/13");

  script_cve_id("CVE-2026-49089");
  script_xref(name:"IAVB", value:"2026-B-0187");

  script_name(english:"Kibana 8.x < 8.16.3 / 8.17.x < 8.17.2 Authorization Bypass (ESA-2026-51)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by an authorization bypass vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Kibana installed on the remote host is 8.x prior to 8.16.3 or 8.17.x prior to 8.17.2. It is, therefore,
affected by an authorization bypass vulnerability:

  - Authorization Bypass Through User-Controlled Key (CWE-639) in Kibana can lead to unauthorized data modification.
    Under certain conditions, an authenticated user could reference another user's AI Assistant conversation identifier
    to access or modify a conversation they do not own. Successful exploitation requires knowledge of a hard-to-guess
    identifier. (CVE-2026-49089)

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-8-16-3-8-17-2-security-update-esa-2026-51/387446
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5041d9bb");
  script_set_attribute(attribute:"solution", value:
"Update to Kibana version 8.16.3, 8.17.2, 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-2026-49089");

  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:"2026/07/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/10");

  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");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'Kibana', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'min_version': '8.0.0', 'fixed_version': '8.16.3'},
        {'min_version': '8.17.0', 'fixed_version': '8.17.2'}
      ]
    }
  ]
};

var result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_NOTE);
vdf::handle_check_and_report_errors(vdf_result:result);