Keycloak 26.6.x < 26.6.6 Multiple Vulnerabilities

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

include('compat.inc');

if (description)
{
  script_id(338316);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/21");

  script_cve_id("CVE-2026-14613", "CVE-2026-15571");

  script_name(english:"Keycloak 26.6.x < 26.6.6 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 26.6.x prior to 26.6.6. It is, therefore, affected by multiple
vulnerabilities:

  - A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak. The mechanism used
    to protect the account-linking process from unauthorized requests relies on a hash that can be predicted
    by a malicious OIDC client. By tricking a user into authenticating, an attacker-controlled client can
    forge a valid linking URL to connect the victim's account to an attacker's external identity. This
    results in a full account takeover, allowing the attacker to log in as the victim. (CVE-2026-15571)

  - A vulnerability was discovered in Keycloak's administrative interface that allows certain administrators
    to see information about groups they should not have access to. When Fine-Grained Admin Permissions
    (FGAP v2) are enabled, an administrator who is allowed to see a specific role can also see a list of all
    groups assigned to that role, because the system fails to check whether the administrator has permission
    to view those specific groups. (CVE-2026-14613)

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://access.redhat.com/errata/RHSA-2026:56523");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:56524");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2026-14613");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2026-15571");
  script_set_attribute(attribute:"solution", value:
"Upgrade Keycloak to version 26.6.6 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:H/UI:N/S:U/C:H/I:N/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-2026-15571");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-14613");

  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:"2026/07/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:keycloak:keycloak");
  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': '26.6.0', 'fixed_version': '26.6.6'}
      ]
    }
  ]
};

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