Apache Tomcat 9.0.40 < 9.0.117 Improper Encoding or Escaping of Output Vulnerability (CVE-2026-34483)

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

include('compat.inc');

if (description)
{
  script_id(334514);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/11");

  script_cve_id("CVE-2026-34483");

  script_name(english:"Apache Tomcat 9.0.40 < 9.0.117 Improper Encoding or Escaping of Output Vulnerability (CVE-2026-34483)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Apache Tomcat server is affected by an improper encoding or escaping of output vulnerability");
  script_set_attribute(attribute:"description", value:
"The version of Tomcat installed on the remote host is 9.0.40 prior to 9.0.117. It is, therefore, affected by a
vulnerability as referenced in the fixed_in_apache_tomcat_9.0.117_security-9 advisory.

  - Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve component of Apache
    Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53,
    from 9.0.40 through 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117 ,
    which fix the issue. (CVE-2026-34483)

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/apache/tomcat/commit/97566842589d0b80de138ca719378861fd017d68
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d958092b");
  # https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.117
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?66d56d5e");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Apache Tomcat version 9.0.117 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-34483");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/04/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/11");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:apache:tomcat:9");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Web Servers");

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

  script_dependencies("os_fingerprint.nasl", "tomcat_error_version.nasl", "tomcat_win_installed.nbin", "apache_tomcat_nix_installed.nbin");
  script_require_keys("installed_sw/Apache Tomcat");

  exit(0);
}

include('vcf_extras.inc');

vcf::tomcat::initialize();
var app_info = vcf::combined_get_app_info(app:'Apache Tomcat');

var constraints = [
  { 'min_version' : '9.0.40', 'fixed_version' : '9.0.117' }
];

vcf::check_all_backporting(app_info:app_info);
vcf::check_granularity(app_info:app_info, sig_segments:3);
vcf::check_version_and_report(
    app_info:app_info,
    constraints:constraints,
    severity:SECURITY_HOLE
);