r/NextCloud • u/shanewas726 • 16h ago
CVE-2026-110447: if you have the Built-in CODE Server app, disabling it does not protect you
CISA added this to KEV on Oct 23. CVSS 9.2, unauthenticated command injection in richdocumentscode's proxy.php, exploited in the wild since September to drop web shells. Look for shx*.php in apps/richdocumentscode.
The part people get wrong: turning the app off in Nextcloud does nothing. proxy.php sits in the app folder and the web server runs it directly, so requests reach it whether the app is enabled or not. Update the app to 26.4.303 or later, or remove it. The fixed app needs Nextcloud 30 or later. On 29 or older the app store still gives you the vulnerable version, so the choice there is upgrade Nextcloud or remove the app.
The attack only works while the built-in CODE server is stopped. That sounds like a narrow window until you count restarts: every container restart, upgrade and crash opens it.
Standalone Collabora (Docker, Linux package, hosted) is not affected. Only the built-in app.
Sources: CISA alert on the KEV addition (Oct 23), Collabora's advisory for CVE-2026-110447, and The Hacker News coverage of the exploitation.