diff --git a/lib/Service/AttachmentService.php b/lib/Service/AttachmentService.php
index a987ddb3a..0c2463be0 100644
--- a/lib/Service/AttachmentService.php
+++ b/lib/Service/AttachmentService.php
@@ -251,6 +251,7 @@ public function update(int $cardId, int $attachmentId, string $data, string $typ
 		}
 
 		if ($service instanceof ICustomAttachmentService) {
+			$this->permissionService->checkPermission($this->cardMapper, $cardId, Acl::PERMISSION_EDIT);
 			try {
 				$attachment = new Attachment();
 				$attachment->setId($attachmentId);