Ticket #18875: 18875.1.diff

wp-admin/includes/class-wp-list-table.php

@@ -91 +91 @@
                 if ( !$args['plural'] )
                         $args['plural'] = $screen->base;
 
+                // Sanitize the provided titles
+                $args['plural'] = sanitize_title( $args['plural'] );
+                $args['singular'] = sanitize_title( $args['singular'] );
+
                 $this->_args = $args;
 
                 if ( $args['ajax'] ) {