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...

CVE-2026-52840

Affected software: Easy!Appointments (self-hosted) prior to 1.6.0. Vulnerability: Server-Side Request Forgery (SSRF) in the CalDAV connection test. In Caldav::connect_to_server (application/controllers/Caldav.php:60), the request’s caldav_url is handed to a Guzzle REPORT call without proper schem...