diff --git plugins/context_reaction_theme.inc plugins/context_reaction_theme.inc
index 5e69972..45717dd 100644
--- plugins/context_reaction_theme.inc
+++ plugins/context_reaction_theme.inc
@@ -66,15 +66,15 @@ class context_reaction_theme extends context_reaction {
     $classes = array();
     foreach ($this->get_contexts() as $k => $v) {
       if (!empty($v->reactions[$this->plugin]['title']) && !isset($vars['section_title'])) {
-        $vars['section_title'] = t($v->reactions[$this->plugin]['title']);
+        $vars['section_title'] = check_plain(t($v->reactions[$this->plugin]['title']));
       }
       if (!empty($v->reactions[$this->plugin]['subtitle']) && !isset($vars['section_subtitle'])) {
-        $vars['section_subtitle'] = t($v->reactions[$this->plugin]['subtitle']);
+        $vars['section_subtitle'] = check_plain(t($v->reactions[$this->plugin]['subtitle']));
       }
       if (!empty($v->reactions[$this->plugin]['class'])) {
         $classes[$v->reactions[$this->plugin]['class']] = $v->reactions[$this->plugin]['class'];
       }
     }
-    $vars['body_classes'] .= !empty($classes) ? ' '. implode(' ', $classes) : '';
+    $vars['body_classes'] .= !empty($classes) ? ' '. check_plain(implode(' ', $classes)) : '';
   }
 }