Cursor < 3.0 Multiple Sandbox Escapes

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

include('compat.inc');

if (description)
{
  script_id(324969);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/06");

  script_cve_id("CVE-2026-50548", "CVE-2026-50549");

  script_name(english:"Cursor < 3.0 Multiple Sandbox Escapes");

  script_set_attribute(attribute:"synopsis", value:
"The Cursor instance installed on the remote host is affected by
multiple sandbox escape vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Cursor installed on the remote host is prior to 3.0.
It is, therefore, affected by multiple vulnerabilities:

  - A flaw in the agent sandbox allows a malicious agent to manipulate
    the working_directory parameter, causing the sandbox to include
    writable paths outside the intended workspace. This enables
    non-sandboxed remote code execution under the user's privileges
    with no user interaction beyond a benign prompt.
    (CVE-2026-50548)

  - A flaw in the agent sandbox path canonicalization allows a
    malicious agent to create an in-workspace symlink pointing outside
    the workspace and force canonicalization to fail, resulting in
    unapproved writes to arbitrary locations. This enables
    non-sandboxed remote code execution under the user's privileges
    with no user interaction beyond a benign prompt.
    (CVE-2026-50549)

Note that Nessus has not tested for these issues but has instead
relied only on the application's self-reported version number.");
  # https://github.com/cursor/cursor/security/advisories/GHSA-3p48-7v9f-v5cw
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4fef00f5");
  # https://github.com/cursor/cursor/security/advisories/GHSA-3v8f-48vw-3mjx
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6f711d92");
  script_set_attribute(attribute:"solution", value:
"Upgrade Cursor to version 3.0 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  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:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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-2026-50549");

  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:"2026/06/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:anysphere:cursor");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/a:anysphere:cursor");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Artificial Intelligence");

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

  script_dependencies("anysphere_cursor_win_installed.nbin", "anysphere_cursor_macos_installed.nbin", "anysphere_cursor_nix_installed.nbin");
  script_require_keys("installed_sw/Anysphere Cursor");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'Anysphere Cursor', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'fixed_version': '3.0'}
      ]
    }
  ]
};

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