diff --git a/lib/Service/AttachmentService.php b/lib/Service/AttachmentService.php
index 82a946c097..e2dd6063f4 100644
--- a/lib/Service/AttachmentService.php
+++ b/lib/Service/AttachmentService.php
@@ -289,6 +289,7 @@ public function update($cardId, $attachmentId, $data, $type = 'deck_file') {
 		}
 
 		if ($service instanceof ICustomAttachmentService) {
+			$this->permissionService->checkPermission($this->cardMapper, $cardId, Acl::PERMISSION_EDIT);
 			try {
 				$attachment = new Attachment();
 				$attachment->setId($attachmentId);