Keycloak 26.2 < 26.2.15 / 26.4 < 26.4.11 / 26.5 < 26.5.7 Multiple Vulnerabilities

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

include('compat.inc');

if (description)
{
  script_id(330085);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/27");

  script_cve_id("CVE-2026-4282", "CVE-2026-4634");
  script_xref(name:"IAVB", value:"2026-B-0201");

  script_name(english:"Keycloak 26.2 < 26.2.15 / 26.4 < 26.4.11 / 26.5 < 26.5.7 Multiple Vulnerabilities");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"Keycloak installed on the remote host is 26.2.x prior to 26.2.15, 26.4.x prior to  26.4.11, 26.5.x prior to 
26.5.7 are affected by multiple vulnerabilities:

  - A privilege escalation flaw exists due to improper isolation in the SingleUseObjectProvider. An
    unauthenticated, remote attacker can forge authorization codes and potentially obtain admin-capable
    access tokens. (CVE-2026-4282)

  - A denial of service flaw exists in the OpenID Connect token endpoint. An unauthenticated, remote
    attacker can exhaust server CPU and memory by sending an excessively long scope parameter.
    (CVE-2026-4634)

Note that Nessus has not tested for these issues 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-h4wv-g838-66g3");
  script_set_attribute(attribute:"see_also", value:"https://github.com/advisories/GHSA-hj93-h7pg-fh6v");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2026-4282");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2026-4634");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:6475");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:6477");
  script_set_attribute(attribute:"solution", value:
"Upgrade Keycloak to version 26.2.15 / 26.4.11 / 26.5.7 or later.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-4634");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/04/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/27");

  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:"I");
  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("Host/local_checks_enabled", "Host/uname", "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': [
        {'min_version': '26.2.0', 'fixed_version': '26.2.15'},
        {'min_version': '26.4.0', 'fixed_version': '26.4.11'},
        {'min_version': '26.5.0', 'fixed_version': '26.5.7'}
      ]
    }
  ]
};

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