Tenable Nessus < 10.12.5 Multiple Vulnerabilities (TNS-2026-26)

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

include('compat.inc');

if (description)
{
  script_id(362484);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/05");

  script_cve_id(
    "CVE-2026-103946",
    "CVE-2026-103947",
    "CVE-2026-103948",
    "CVE-2026-103950",
    "CVE-2026-103951",
    "CVE-2026-103952",
    "CVE-2026-103953",
    "CVE-2026-103954",
    "CVE-2026-103955"
  );

  script_name(english:"Tenable Nessus < 10.12.5 Multiple Vulnerabilities (TNS-2026-26)");

  script_set_attribute(attribute:"synopsis", value:
"An instance of Nessus installed on the remote system is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version, the Tenable Nessus application running on the remote host is prior to 10.12.5.
It is, therefore, affected by multiple vulnerabilities as referenced in the TNS-2026-26 advisory.

  - Nessus did not sufficiently verify the integrity of certain downloaded content before using it, which could
    allow an authenticated, privileged attacker to compromise the system. (CVE-2026-103947)

  - An SQL injection vulnerability could allow an authenticated user to read or modify data stored by Nessus.
    (CVE-2026-103946)

  - Improper handling of inconsistent length values could allow an authenticated, privileged attacker to
    compromise the confidentiality, integrity or availability of Nessus. (CVE-2026-103948)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://www.tenable.com/security/TNS-2026-26");
  script_set_attribute(attribute:"see_also", value:"https://docs.tenable.com/release-notes/Content/nessus/2026.htm");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Tenable Nessus 10.12.5 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/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: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-2026-103947");

  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:"2026/10/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/02");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:tenable:nessus");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  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("nessus_detect.nasl", "nessus_installed_win.nbin", "nessus_installed_linux.nbin", "macos_nessus_installed.nbin");
  script_require_keys("installed_sw/Tenable Nessus");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'Tenable Nessus', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'fixed_version': '10.12.5'}
      ]
    }
  ]
};

var vdf_result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_WARNING, flags:{'sqli':TRUE});
vdf::handle_check_and_report_errors(vdf_result:vdf_result);