Attackers exploit Collabora RCE to backdoor Nextcloud
๐ก๏ธ Threat actors have begun exploiting a critical command execution flaw (CVE-2026-110447) in the Collabora Online built-in CODE Server app for Nextcloud. The vulnerability affects richdocumentscode versions prior to 26.4.303 and enables OS command injection via the appโs proxy.php endpoint when the bundled CODE server is stopped, requiring no authentication. Administrators are urged to update to 26.4.303 or remove the app, as operators have reportedly deployed PHP webshells and searched for credentials and crypto wallets.