Zabbix Server 6.0.x < 6.0.47 / 7.0.x < 7.0.27 / 7.4.x < 7.4.11 DoS (ZBX-28075)

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

include('compat.inc');

if (description)
{
  script_id(338768);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/24");

  script_cve_id("CVE-2026-23938");

  script_name(english:"Zabbix Server 6.0.x < 6.0.47 / 7.0.x < 7.0.27 / 7.4.x < 7.4.11 DoS (ZBX-28075)");

  script_set_attribute(attribute:"synopsis", value:
"A monitoring application installed on the remote host is affected by a denial of service vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Zabbix Server installed on the remote host is 6.0.x prior to 6.0.47, 7.0.x prior to 7.0.27, or 7.4.x
prior to 7.4.11. It is, therefore, affected by a denial of service vulnerability:

  - An authenticated administrator is able to crash Zabbix server by creating specifically crafted
    preprocessing/script item JavaScript scripts, leading to potential denial of service. (CVE-2026-23938)

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://support.zabbix.com/browse/ZBX-28075");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Zabbix version 6.0.47, 7.0.27, 7.4.11 or later.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:P");
  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:H/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-23938");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(248);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:zabbix:zabbix_server");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("zabbix_server_nix_installed.nbin");
  script_require_keys("installed_sw/Zabbix Server");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'requires': [{'scope': 'target', 'match': {'os': 'linux'}}],
  'checks': [
    {
      'product': {'name': 'Zabbix Server', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'min_version':'6.0.0', 'fixed_version':'6.0.47'},
        {'min_version':'7.0.0', 'fixed_version':'7.0.27'},
        {'min_version':'7.4.0', 'fixed_version':'7.4.11'}
      ]
    }
  ]
};

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