In CiviCRM before 5.28.1 and CiviCRM ESR before 5.27.5 ESR, the CKEditor configuration form allows CSRF.
https://civicrm.org/advisory/civi-sa-2020-11-csrf-ckeditor-configuration-form
https://blog.sonarsource.com/civicrm-code-execution-vulnerability-chain-explained/