The plugin was affected by a reflected Cross-Site Scripting vulnerability inside of the administration panel, via the ‘s’ GET parameter on the Donors page.
https://example.com/wp-admin/edit.php?s=">&start-date;&end-date;&form;_id=0&action;=-1&paged;=1&give;_action=delete_bulk_donor&orderby;=idℴ=DESC&action2;=-1&post;_type=give_forms&page;=give-donors&view;=donors
bentl.ee/posts/cve-givewp/