diff --git a/core/lib/Drupal/Core/Field/FieldDefinition.php b/core/lib/Drupal/Core/Field/FieldDefinition.php
index 8e57f7c..c5dea1a 100644
--- a/core/lib/Drupal/Core/Field/FieldDefinition.php
+++ b/core/lib/Drupal/Core/Field/FieldDefinition.php
@@ -156,7 +156,7 @@ public function setFieldLabel($label) {
    * {@inheritdoc}
    */
   public function getFieldDescription() {
-    return $this->definition['description'];
+    return Xss::filterAdmin($this->definition['description']);
   }
 
   /**