Ticket #53839: 53839-noopener-on-blogroll-links.diff

src/wp-includes/bookmark-template.php

@@ -101 +101 @@
                 if ( '' !== $title ) {
                         $title = ' title="' . $title . '"';
                 }
+
                 $rel = $bookmark->link_rel;
+                if ( '_blank' === $bookmark->link_target ) {
+                        if ( ! empty( $rel ) ) {
+                                $rels   = explode( ' ', $rel );
+                                $rels[] = 'noopener';
+                                $rel    = implode( ' ', $rels );
+                        } else {
+                                $rel = 'noopener';
+                        }
+                }
+
                 if ( '' !== $rel ) {
                         $rel = ' rel="' . esc_attr( $rel ) . '"';
                 }