diff --git a/typo3/sysext/form/Classes/Mvc/Persistence/FormPersistenceManager.php b/typo3/sysext/form/Classes/Mvc/Persistence/FormPersistenceManager.php
index ee7c86b1da956f8e7b5258d7aeb0b549921ee3b4..d38537acf3c6074afad848a4dc8c9f6ce6f8d11d 100644
--- a/typo3/sysext/form/Classes/Mvc/Persistence/FormPersistenceManager.php
+++ b/typo3/sysext/form/Classes/Mvc/Persistence/FormPersistenceManager.php
@@ -872,7 +872,13 @@ class FormPersistenceManager implements FormPersistenceManagerInterface
         $pathInfo = PathUtility::pathinfo($fileName, PATHINFO_DIRNAME);
         $pathInfo = is_string($pathInfo) ? $pathInfo : '';
         $dirName = rtrim($pathInfo, '/') . '/';
-        return array_key_exists($dirName, $this->getAccessibleFormStorageFolders());
+
+        foreach (array_keys($this->getAccessibleFormStorageFolders()) as $allowedPath) {
+            if (str_starts_with($dirName, $allowedPath)) {
+                return true;
+            }
+        }
+        return false;
     }
 
     /**