Act
active
Collabora CODE Server Flaw Used to Backdoor Nextcloud Servers
- Engineer — Act: Active exploitation confirmed with web shells planted on Nextcloud servers since at least September 10. If you run Nextcloud with the Collabora Online Built-in CODE Server app, audit for web shell files in the web root and disable or patch the plugin immediately.
- SOC/IR — Act: Confirmed active exploitation with web shell deployment provides a concrete hunt target — sweep Nextcloud server logs for anomalous command execution spawned by the web server process dating back to September 10, and look for unauthorized files in Nextcloud’s web-accessible directories.
- Leader — Plan: Active backdooring of Nextcloud deployments via an optional collaboration plugin is a real risk if the organization runs self-hosted Nextcloud — confirm with engineering whether this plugin is in use and that incident response is underway; not yet a board-level event.
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