Fortinet FortiWeb Broken access control in the RADIUS type admin group (FG-IR-26-158)

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

include('compat.inc');

if (description)
{
  script_id(337247);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/18");

  script_cve_id("CVE-2026-26035");

  script_name(english:"Fortinet FortiWeb Broken access control in the RADIUS type admin group (FG-IR-26-158)");

  script_set_attribute(attribute:"synopsis", value:
"Fortinet Firewall is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The version of FortiWeb installed on the remote host is prior to tested version. It is, therefore, affected by a
vulnerability as referenced in the FG-IR-26-158 advisory.

  - An Improper Authentication vulnerability [CWE-287] vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.2,
    FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4.0 through 7.4.11, FortiWeb 7.2.0 through 7.2.12, FortiWeb 7.0.0
    through 7.0.12 may allow a remote unauthenticated attacker to login into the Fortiweb GUI/CLI with a
    random username and password (CVE-2026-26035)

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://www.fortiguard.com/psirt/FG-IR-26-158");
  # https://docs.fortinet.com/document/fortiweb/8.0.2/cli-reference/810797/system-admin
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c7651599");
  # https://docs.fortinet.com/document/fortiweb/8.0.3/administration-guide/286471/administrators
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b3ee1138");
  script_set_attribute(attribute:"solution", value:
"For 7.2.x, upgrade to FortiWeb version 7.2.13 or later. For 7.4.x, upgrade to FortiWeb version 7.4.12 or later. For
7.6.x, upgrade to FortiWeb version 7.6.7 or later. For 8.0.x, upgrade to FortiWeb version 8.0.3 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/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:N/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-2026-26035");

  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:"2026/08/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/18");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:fortinet:fortiweb");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Firewalls");

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

  script_dependencies("fortinet_version.nbin");
  script_require_keys("Host/Fortigate/model", "Host/Fortigate/version", "Settings/ParanoidReport");

  exit(0);
}

include('vcf_extras_fortios.inc');

# Since there's a workaround specified in the advisory, we're making this require paranoid.
if (report_paranoia < 2) audit(AUDIT_PARANOID);

var app_name = 'FortiWeb';
var app_info = vcf::get_app_info(app:app_name, kb_ver:'Host/Fortigate/version');
vcf::fortios::verify_product_and_model(product_name:app_name);

var constraints = [
  { 'min_version' : '7.2.0', 'max_version' : '7.2.12', 'fixed_version' : '7.2.13' },
  { 'min_version' : '7.4.0', 'max_version' : '7.4.11', 'fixed_version' : '7.4.12' },
  { 'min_version' : '7.6.0', 'max_version' : '7.6.6', 'fixed_version' : '7.6.7' },
  { 'min_version' : '8.0.0', 'max_version' : '8.0.2', 'fixed_version' : '8.0.3' }
];

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