Index: wp-admin/post.php
===================================================================
--- wp-admin/post.php	(revision 3825)
+++ wp-admin/post.php	(working copy)
@@ -322,7 +322,7 @@
 
 case 'editedcomment':
 
-	check_admin_referer('update-comment');
+	check_admin_referer('update-comment' . $_POST['comment_ID']);
 
 	edit_comment();