CKEditor 45.x < 47.7.4 / 48.x < 48.5.1 XSS

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

include('compat.inc');

if (description)
{
  script_id(373617);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/30");

  script_cve_id("CVE-2026-116688");
  script_xref(name:"IAVA", value:"2026-A-1222");

  script_name(english:"CKEditor 45.x < 47.7.4 / 48.x < 48.5.1 XSS");

  script_set_attribute(attribute:"synopsis", value:
"The remote web server may be affected by a cross site scripting vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of CKEditor included on the remote web host is 45.x prior to 47.7.4, or 48.x prior to 48.5.1. It is,
therefore, affected by a cross-site scripting (XSS) vulnerability. The CKEditor 5 engine uses a vulnerable es-toolkit
version whose prototype-pollution behavior can be reached while CKEditor processes incoming style attribute values.
Crafted editor content can thereby cause unauthorized JavaScript execution in the browser.

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/ckeditor/ckeditor5/security/advisories/GHSA-rh54-vffm-5fvp
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2cbd9462");
  script_set_attribute(attribute:"see_also", value:"https://github.com/ckeditor/ckeditor5/releases/tag/v47.7.4");
  script_set_attribute(attribute:"see_also", value:"https://github.com/ckeditor/ckeditor5/releases/tag/v48.5.1");
  script_set_attribute(attribute:"solution", value:
"Upgrade to CKEditor 47.7.4 / 48.5.1 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-116688");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/09/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/29");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:cksource:ckeditor");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses : XSS");

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

  script_dependencies("cksource_ckeditor_cdn_detect.nbin");
  script_require_keys("installed_sw/CKSource CKEditor");

  exit(0);
}

include('vcf.inc');

var app_info = vcf::combined_get_app_info(app:'CKSource CKEditor');

var constraints = [
  {'min_version':'45.0.0', 'fixed_version':'47.7.4'},
  {'min_version':'48.0.0', 'fixed_version':'48.5.1'}
];

vcf::check_version_and_report(
  app_info:app_info,
  constraints:constraints,
  severity:SECURITY_HOLE,
  flags:{xss:TRUE}
);