Microsoft PowerShell 7.4.x < 7.4.19 / 7.5.x < 7.5.10 / 7.6.x < 7.6.5 Multiple Vulnerabilities (August 2026)

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

include('compat.inc');

if (description)
{
  script_id(335413);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/14");

  script_cve_id(
    "CVE-2026-58612",
    "CVE-2026-59119",
    "CVE-2026-70337",
    "CVE-2026-70338"
  );
  script_xref(name:"IAVA", value:"2026-A-0844");

  script_name(english:"Microsoft PowerShell 7.4.x < 7.4.19 / 7.5.x < 7.5.10 / 7.6.x < 7.6.5 Multiple Vulnerabilities (August 2026)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft PowerShell install on the remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Microsoft PowerShell installed on the remote host is 7.4.x prior to 7.4.19, 7.5.x prior to 7.5.10, or
7.6.x prior to 7.6.5. It is, therefore, affected by multiple vulnerabilities:

  - Relative path traversal in Microsoft PowerShell Core allows an unauthorized attacker to execute code over a
    network. (CVE-2026-70337)

  - Server-side request forgery (SSRF) in Microsoft PowerShell Core allows an unauthorized attacker to disclose
    information over a network. (CVE-2026-58612)

  - Improper control of generation of code ('code injection') in Microsoft PowerShell allows an unauthorized
    attacker to bypass a security feature locally. (CVE-2026-70338)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58612");
  script_set_attribute(attribute:"see_also", value:"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59119");
  script_set_attribute(attribute:"see_also", value:"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70337");
  script_set_attribute(attribute:"see_also", value:"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70338");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Microsoft PowerShell version 7.4.19, 7.5.10, 7.6.5, or later.");
  script_set_attribute(attribute:"agent", value:"windows");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-70337");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:powershell");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows : Microsoft Bulletins");

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

  script_dependencies("smb_hotfixes.nasl", "wmi_enum_windows_app_store.nbin");
  script_require_keys("SMB/Registry/Enumerated", "WMI/Windows App Store/Enumerated", "installed_sw/Microsoft.PowerShell");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'Microsoft.PowerShell', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'min_version': '7.4.0', 'fixed_version': '7.4.19'},
        {'min_version': '7.5.0', 'fixed_version': '7.5.10'},
        {'min_version': '7.6.0', 'fixed_version': '7.6.5'}
      ]
    }
  ]
};

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