Attackers have been exploiting a critical flaw in an optional Nextcloud app that runs Collabora's document editor, planting webshells and hunting for passwords and crypto wallets on the servers they get into. The bug is CVE-2026-110447. It affects the Collabora Online Built-in CODE Server app, known in Nextcloud as richdocumentscode, before version 26.4.303.

Screenshot: Collabora Productivity / Wikimedia Commons (CC BY-SA 4.0)