ConnectWise ScreenConnect < 26.2 Improper Input Validation (CVE-2026-11596)

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

include('compat.inc');

if (description)
{
  script_id(321345);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/18");

  script_cve_id("CVE-2026-11596");

  script_name(english:"ConnectWise ScreenConnect < 26.2 Improper Input Validation (CVE-2026-11596)");

  script_set_attribute(attribute:"synopsis", value:
"A remote access server installed on the remote host is affected by an improper input validation vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its version, the ConnectWise ScreenConnect remote access software installed on the remote host is prior to
26.2. It is, therefore, affected by an improper input validation vulnerability:

  - Input validation within the Host Pass creation functionality could allow an authenticated user with Host Pass
    creation privileges the ability to specify a token expiration duration beyond the intended maximum when generating
    delegated access tokens. (CVE-2026-11596)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://github.com/ConnectWise-Advisories/Disclosures/tree/main/CVE-2026-11596
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ff83f2cc");
  script_set_attribute(attribute:"solution", value:
"Upgrade to ConnectWise ScreenConnect version 26.2 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:M/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:L/I:L/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-11596");

  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:"2026/06/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/17");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:connectwise:screenconnect");
  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("connectwise_screenconnect_win_installed.nbin", "connectwise_screenconnect_nix_installed.nbin");
  script_require_keys("installed_sw/ConnectWise ScreenConnect");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'ConnectWise ScreenConnect', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [ {'fixed_version': '26.2'} ]
    }
  ]
};

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