diff --git a/Web/templates/upload_batch.html b/Web/templates/upload_batch.html
index d80bf9c..d38cf06 100644
--- a/Web/templates/upload_batch.html
+++ b/Web/templates/upload_batch.html
@@ -168,7 +168,8 @@
             try {
                 const response = await fetch('/upload_csv_batch', {
                     method: 'POST',
-                    body: formData
+                    body: formData,
+                    credentials: 'include'
                 });
 
                 // Antwort einmalig als Text auslesen, um sowohl JSON als auch HTML-Fehler abzufangen