Adobe InCopy < 20.5.1 / 21.0 < 21.1.0 Arbitrary code execution (APSB26-04)

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

include('compat.inc');

if (description)
{
  script_id(283677);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/30");

  script_cve_id("CVE-2026-21281");
  script_xref(name:"IAVA", value:"2026-A-0042-S");

  script_name(english:"Adobe InCopy < 20.5.1 / 21.0 < 21.1.0 Arbitrary code execution (APSB26-04)");

  script_set_attribute(attribute:"synopsis", value:
"The Adobe InCopy instance installed on the remote host is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Adobe InCopy installed on the remote host is prior to 20.5.1, 21.1.0. It is, therefore, affected by a
vulnerability as referenced in the APSB26-04 advisory.

  - InCopy versions 21.0, 19.5.5 and earlier are affected by a Heap-based Buffer Overflow vulnerability that
    could result in arbitrary code execution in the context of the current user. Exploitation of this issue
    requires user interaction in that a victim must open a malicious file. (CVE-2026-21281)

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://helpx.adobe.com/security/products/incopy/apsb26-04.html");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Adobe InCopy version 20.5.1, 21.1.0 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:L/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:L/AC:L/PR:N/UI:R/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:"cvss_score_source", value:"CVE-2026-21281");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(122);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/01/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/01/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/01/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:adobe:incopy");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  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("adobe_incopy_win_installed.nbin", "adobe_incopy_mac_installed.nbin");
  script_require_keys("installed_sw/Adobe InCopy");

  exit(0);
}

include('vcf.inc');

var app = 'Adobe InCopy';
var win_local;
if (!empty_or_null(get_kb_item('SMB/Registry/Enumerated')))
  win_local = TRUE;
else
  win_local = FALSE;

var app_info = vcf::get_app_info(app:app, win_local:win_local);

var constraints = [
  { 'fixed_version' : '20.5.1' },
  { 'min_version' : '21.0', 'fixed_version' : '21.1.0' }
];

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