The Post Content XMLRPC WordPress plugin through 1.0 does not sanitise or escape multiple GET/POST parameters before using them in SQL statements in the admin dashboard, leading to an authenticated SQL Injections
https://wpscan.com/vulnerability/fb42980c-93e5-42d5-a478-c2b348eaea67
https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-11541
https://codevigilant.com/disclosure/2021/wp-plugin-post-content-xmlrpc/