The Nextcloud Notes app is a distraction free notes taking app for Nextcloud. If an attacker managed to share a folder called `Notes/` with a newly created user before they logged in, the Notes app would use that folder store the personal notes. It is recommended that the Nextcloud Notes app is upgraded to 4.9.3.

Уязвимость приложения для создания заметок Nextcloud Notes, позволяющая нарушителю получить доступ к конфиденциальной информации

Уязвимость nextcloud-app-notes