Anthropic Claude Code 0.2.54 < 2.1.163 Data Exfiltration (CVE-2026-54316)

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

include('compat.inc');

if (description)
{
  script_id(322792);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/02");

  script_cve_id("CVE-2026-54316");
  script_xref(name:"IAVA", value:"2026-A-0624");

  script_name(english:"Anthropic Claude Code 0.2.54 < 2.1.163 Data Exfiltration (CVE-2026-54316)");

  script_set_attribute(attribute:"synopsis", value:
"An application installed on the remote host is affected by a data
exfiltration vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Anthropic Claude Code installed on the remote host is
0.2.54 prior to 2.1.163. It is, therefore, affected by a data
exfiltration vulnerability.

  - Because the hostname huggingface.co was pre-approved as a bare
      hostname for the WebFetch tool, any path on that domain including
      attacker-controlled model repositories was auto-approved without a
      permission prompt or being subject to --allowedTools restrictions.
      An attacker able to inject untrusted content into a Claude Code
      context could direct it to issue WebFetch requests against
      attacker-controlled repository files, which HuggingFace counts as
      downloads server-side, creating a covert out-of-band channel for
      encoding and exfiltrating data Claude can access such as files,
      environment variables, or command output. Reliably exploiting this
      required the ability to add untrusted content into a Claude Code
      context window. (CVE-2026-54316)

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/anthropics/claude-code/security/advisories/GHSA-fg94-h982-f3mm
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a8927a88");
  script_set_attribute(attribute:"solution", value:
"Upgrade Anthropic Claude Code to version 2.1.163 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:N");
  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:N");
  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:P/PR:N/UI:P/VC:H/VI:N/VA:N/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-2026-54316");

  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:"2026/06/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/25");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:anthropic:claude_code");
  script_set_attribute(attribute:"stig_severity", value:"II");
  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("anthropic_claude_code_win_installed.nbin", "anthropic_claude_code_macos_installed.nbin", "anthropic_claude_code_nix_installed.nbin");
  script_require_keys("installed_sw/Anthropic Claude Code");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'Anthropic Claude Code', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {
          'min_version': '0.2.54',
          'fixed_version': '2.1.163'
        }
      ]
    }
  ]
};

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