Kibana 8.x < 8.19.20 / 9.0.x < 9.3.5 / 9.4.x < 9.4.2 Denial of Service (ESA-2026-136)

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

include('compat.inc');

if (description)
{
  script_id(338733);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/21");

  script_cve_id("CVE-2026-49096");
  script_xref(name:"IAVB", value:"2026-B-0232");

  script_name(english:"Kibana 8.x < 8.19.20 / 9.0.x < 9.3.5 / 9.4.x < 9.4.2 Denial of Service (ESA-2026-136)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by a denial of service vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Kibana installed on the remote host is 8.x prior to 8.19.20, 9.0.x prior to 9.3.5, or 9.4.x prior to
9.4.2. It is, therefore, affected by a vulnerability as referenced in the ESA-2026-136 advisory.

  - Uncaught Exception (CWE-248) in Kibana Cases can lead to denial of service via Input Data Manipulation
    (CAPEC-153). Malformed link syntax stored in a case comment was not rejected or sanitized when the comment
    was later formatted for display, and the resulting unhandled error prevented the affected case from being
    displayed. An authenticated user holding privileges to comment on a case could store such a comment, after
    which that case became inaccessible to every user who opened it until the stored comment was removed.
    (CVE-2026-49096)

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-8-19-20-9-3-5-9-4-2-security-update-esa-2026-136/389492
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?706a378b");
  script_set_attribute(attribute:"solution", value:
"Update to Kibana version 8.19.20, 9.3.5, 9.4.2 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-49096");

  script_cwe_id(248);

  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' : '8.0.0', 'fixed_version' : '8.19.20' },
  { '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_WARNING
);