1 files changed, 1 insertions, 1 deletions
diff --git a/misc/ajax.js b/misc/ajax.js
index 29483b498..3b9dec614 100644
--- a/misc/ajax.js
+++ b/misc/ajax.js
@@ -348,7 +348,7 @@ Drupal.ajax.prototype.beforeSend = function (xmlhttprequest, options) {
     // this is only needed for IFRAME submissions.
     var v = $.fieldValue(this.element);
     if (v !== null) {
-      options.extraData[this.element.name] = v;
+      options.extraData[this.element.name] = Drupal.checkPlain(v);
     }
   }