diff --git a/wp-admin/post.php b/wp-admin/post.php
index c945be13c..0ea17be8c 100644
--- a/wp-admin/post.php
+++ b/wp-admin/post.php
@@ -77,6 +77,8 @@ case 'edit':
 	break;
 
 case 'editattachment':
+	check_admin_referer();
+
 	$post_id = (int) $_POST['post_ID'];
 
 	// Don't let these be changed