diff --git src/wp-admin/edit.php src/wp-admin/edit.php
index c2a2b6990c..31e3f6b026 100644
--- src/wp-admin/edit.php
+++ src/wp-admin/edit.php
@@ -482,7 +482,7 @@ $_SERVER['REQUEST_URI'] = remove_query_arg( array( 'locked', 'skipped', 'updated
 <?php $wp_list_table->search_box( $post_type_object->labels->search_items, 'post' ); ?>
 
 <input type="hidden" name="post_status" class="post_status_page" value="<?php echo ! empty( $_REQUEST['post_status'] ) ? esc_attr( $_REQUEST['post_status'] ) : 'all'; ?>" />
-<input type="hidden" name="post_type" class="post_type_page" value="<?php echo $post_type; ?>" />
+<input type="hidden" name="post_type" class="post_type_page" value="<?php echo esc_attr( $post_type ); ?>" />
 
 <?php if ( ! empty( $_REQUEST['author'] ) ) { ?>
 <input type="hidden" name="author" value="<?php echo esc_attr( $_REQUEST['author'] ); ?>" />