WordPress Yoast SEO Plugin < 3.4.1 XSS Vulnerability

# SPDX-FileCopyrightText: 2025 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

CPE = "cpe:/a:yoast:yoast_seo";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.124743");
  script_version("2025-02-28T05:38:49+0000");
  script_tag(name:"last_modification", value:"2025-02-28 05:38:49 +0000 (Fri, 28 Feb 2025)");
  script_tag(name:"creation_date", value:"2025-02-20 08:10:51 +0000 (Thu, 20 Feb 2025)");
  script_tag(name:"cvss_base", value:"3.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:S/C:N/I:P/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-04-09 19:36:45 +0000 (Fri, 09 Apr 2021)");

  script_cve_id("CVE-2021-24153");

  script_tag(name:"qod_type", value:"remote_banner");

  script_tag(name:"solution_type", value:"VendorFix");

  script_name("WordPress Yoast SEO Plugin < 3.4.1 XSS Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2025 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_wordpress_plugin_http_detect.nasl");
  script_mandatory_keys("wordpress/plugin/wordpress-seo/detected");

  script_tag(name:"summary", value:"The WordPress plugin 'Yoast SEO' is prone to a cross-site
  scripting (XSS) vulnerability.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"insight", value:"A stored cross-site scripting vulnerability was discovered in
  the Yoast SEO WordPress plugin, which had built-in blacklist filters which were blacklisting
  parentheses as well as several functions such as alert, but bypasses were found.");

  script_tag(name:"affected", value:"WordPress Yoast SEO plugin prior to version 3.4.1.");

  script_tag(name:"solution", value:"Update to version 3.4.1 or later.");

  script_xref(name:"URL", value:"https://www.wordfence.com/threat-intel/vulnerabilities/wordpress-plugins/wordpress-seo/yoast-seo-340-authenticated-stored-cross-site-scripting");

  exit(0);
}

include("host_details.inc");
include("version_func.inc");

if( ! port = get_app_port( cpe: CPE ) )
  exit( 0 );

if( ! infos = get_app_version_and_location( cpe: CPE, port: port, exit_no_version: TRUE ) )
  exit( 0 );

version = infos["version"];
location = infos["location"];

if( version_is_less( version: version, test_version: "3.4.1" ) ) {
  report = report_fixed_ver( installed_version: version, fixed_version: "3.4.1", install_path: location );
  security_message( port: port, data: report );
  exit( 0 );
}

exit( 99 );