Fixed issue #19003: [security] XSS Reflected via import file function (…

…#3369)

Co-authored-by: lapiudevgit <devgit@lapiu.biz>

application/views/admin/participants/uploadSummary_view.php

@@ -47,7 +47,7 @@
             }
             $warningSummary .= "<div class='badtokenlist' id='duplicateslist'><ul>";
             foreach ($duplicatelist as $data) {
-                $warningSummary .= "<li>" . $data . "</li>";
+                $warningSummary .= "<li>" . CHtml::encode($data) . "</li>";
             }
             $warningSummary .= "</ul></div></li>";
         }