diff --git a/admin/tool/log/classes/helper/reader.php b/admin/tool/log/classes/helper/reader.php
index ae0a376c816..f64e9f1bfe9 100644
--- a/admin/tool/log/classes/helper/reader.php
+++ b/admin/tool/log/classes/helper/reader.php
@@ -75,7 +75,7 @@ trait reader {
      */
     public static function decode_other(?string $other) {
         if ($other === 'N;' || preg_match('~^.:~', $other ?? '')) {
-            return unserialize($other);
+            return unserialize($other, ['allowed_classes' => [stdClass::class]]);
         } else {
             return json_decode($other ?? '', true);
         }