The Qubely WordPress plugin before 1.7.8 does not have authorisation and CSRF check on the qubely_delete_saved_block AJAX action, and does not ensure that the block to be deleted belong to the plugin, as a result, any authenticated users, such as subscriber can delete arbitrary posts
https://wpscan.com/vulnerability/e88b7a70-ee71-439f-b3c6-0300adb980b0