Import all XML, CSV & TXT into WordPress < 6.5.8 - Admin+ SQLi

The plugin does not properly sanitise and escape imported data before using them back SQL statements, leading to SQL injection exploitable by high privilege users such as admin

PoC

With the additional https://wordpress.org/plugins/polylang/ plugin installed, import a CSV with the following payload in the language_code column: en’ union select if(user_login=‘wordpress’,sleep(5),null) from wp_users#