The Nested Pages WordPress plugin <= 3.1.15 was vulnerable to an Open Redirect via the `page` POST parameter in the `npBulkActions`, `npBulkEdit`, `npListingSort`, and `npCategoryFilter` `admin_post` actions.
https://www.wordfence.com/blog/2021/08/nested-pages-pat%E2%80%A6on-vulnerability/