CVE-2026-52840 Easy!Appointments has server-side request forgery in CalDAV connection test that exposes the deployment's internal network

Easy!Appointments is a self hosted appointment scheduler. In versions prior to 1.6.0, Caldav::connecttoserver at application/controllers/Caldav.php:60 hands the request's caldavurl to a Guzzle REPORT call without scheme or host validation. A logged-in backend user admin, provider, or secretary...