Index: src/wp-includes/kses.php
===================================================================
--- src/wp-includes/kses.php	(revision 52989)
+++ src/wp-includes/kses.php	(working copy)
@@ -2520,6 +2520,9 @@
 		'aria-label'       => true,
 		'aria-labelledby'  => true,
 		'aria-hidden'      => true,
+		'aria-expanded'    => true,
+		'aria-controls'    => true,
+		'aria-current'     => true,
 		'class'            => true,
 		'data-*'           => true,
 		'dir'              => true,