Python Library marimo < 0.23.0 Pre-Auth RCE (CVE-2026-39987)

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

include('compat.inc');

if (description)
{
  script_id(310047);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/24");

  script_cve_id("CVE-2026-39987");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2026/05/07");

  script_name(english:"Python Library marimo < 0.23.0 Pre-Auth RCE (CVE-2026-39987)");

  script_set_attribute(attribute:"synopsis", value:
"A Python library installed on the remote host is affected by a remote code execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"The detected version of the marimo Python package is prior to 0.23.0. It is, therefore, affected by a remote code
execution vulnerability:

  - The terminal WebSocket endpoint /terminal/ws lacks authentication validation, allowing an unauthenticated
    attacker to obtain a full PTY shell and execute arbitrary system commands. Unlike other WebSocket endpoints
    that correctly call validate_auth() for authentication, the /terminal/ws endpoint only checks the running
    mode and platform support before accepting connections, completely skipping authentication verification.
    (CVE-2026-39987)

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/marimo-team/marimo/security/advisories/GHSA-2679-6mx9-h9xc
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3815eb6b");
  script_set_attribute(attribute:"solution", value:
"Upgrade to marimo version 0.23.0 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:F/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:F/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:A");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-39987");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/04/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"asset_categories", value:"component");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:marimo:marimo");
  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("python_packages_installed_nix.nbin", "python_packages_win_installed.nbin");
  script_require_ports("Host/nix/Python/Packages/Enumerated", "Host/win/Python/Packages/Enumerated");

  exit(0);
}

include('python.inc');

var pkg = 'marimo';

var libs = python::get_package_info(pkg_name:pkg, cpe:"cpe:/a:marimo:marimo");

if (empty_or_null(libs))
  audit(AUDIT_NOT_INST, pkg);

vcf::check_all_backporting(app_info:libs);

var constraints = [
  { 'fixed_version' : '0.23.0' }
];

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