Keycloak < 26.6.4 Multiple Vulnerabilities

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

include('compat.inc');

if (description)
{
  script_id(324966);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/06");

  script_cve_id(
    "CVE-2026-9083",
    "CVE-2026-9086",
    "CVE-2026-9099",
    "CVE-2026-9705",
    "CVE-2026-9795",
    "CVE-2026-9799",
    "CVE-2026-9800",
    "CVE-2026-11800"
  );
  script_xref(name:"IAVB", value:"2026-B-0178");

  script_name(english:"Keycloak < 26.6.4 Multiple Vulnerabilities");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Keycloak installed on the remote host is prior to 26.6.4. It is, therefore, affected by multiple
vulnerabilities, including the following:

  - A user with group-admin privileges can escalate to realm-admin, gaining full administrative control
    over the realm. (CVE-2026-9099)

  - An authentication bypass exists via JWT algorithm confusion, allowing unauthorized access.
    (CVE-2026-11800)

  - Any authenticated user can bypass all authorization policies, including role, scope, and UMA
    permission checks, by including the configured access-denied page path within a request URL, gaining
    unauthorized access to protected resources. (CVE-2026-9800)

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/keycloak/keycloak/releases/tag/26.6.4");
  script_set_attribute(attribute:"solution", value:
"Upgrade Keycloak to version 26.6.4 or later.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/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:L/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-2026-9800");

  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:"2026/06/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/03");

  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': [
        {'fixed_version': '26.6.4'}
      ]
    }
  ]
};

var res = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_HOLE, flags:{"xss":TRUE});
vdf::handle_check_and_report_errors(vdf_result:res);