Keycloak x < 26.4.9 / 26.5.x < 26.5.2 Token Exchange Vulnerability

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

include('compat.inc');

if (description)
{
  script_id(297527);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/24");

  script_cve_id("CVE-2025-14559");
  script_xref(name:"IAVB", value:"2026-B-0023-S");

  script_name(english:"Keycloak x < 26.4.9 / 26.5.x < 26.5.2 Token Exchange Vulnerability");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The version of Keycloak installed on the remote host is prior to 26.4.9 / 26.5.2 / 26.6.0. It is, therefore, affected by the following
Token Exchange vulnerability:
  
  - A flaw was found in the keycloak-services component of Keycloak. This vulnerability allows the issuance of access 
    and refresh tokens for disabled users, leading to unauthorized use of previously revoked privileges, via a business 
    logic vulnerability in the Token Exchange implementation when a privileged client invokes the token exchange flow. 
    (CVE-2025-14559)

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://github.com/advisories/GHSA-wv3h-x6c4-r867");
  script_set_attribute(attribute:"see_also", value:"https://github.com/keycloak/keycloak/issues/45651");
  script_set_attribute(attribute:"solution", value:
"Update to KeyCloak Version 26.5.2 or higher");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:M/C:C/I:C/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-14559");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/01/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/01/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/02/02");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:keycloak:keycloak");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  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("keycloak_nix_installed.nbin");
  script_require_keys("installed_sw/Keycloak");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'Keycloak', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints' : [
        { 'fixed_version' : '26.4.9' },
        { 'min_version': '26.5.0', 'fixed_version' : '26.5.2' }
      ]
    }
  ]
};

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