Index: src/wp-includes/widgets.php
===================================================================
--- src/wp-includes/widgets.php	(revision 42201)
+++ src/wp-includes/widgets.php	(working copy)
@@ -421,7 +421,7 @@
 	global $wp_registered_sidebars;
 
 	if ( isset($wp_registered_sidebars[$id]['description']) )
-		return esc_html( $wp_registered_sidebars[$id]['description'] );
+		return wp_kses_data( $wp_registered_sidebars[$id]['description'] );
 }
 
 /**