CVE-2026-52840: Alextselegidis Easyappointments

Low severity, CVSS 2.7. EPSS: 0.3% chance of exploitation in the next 30 days.

Easy!Appointments is a self hosted appointment scheduler. In versions prior to 1.6.0, `Caldav::connect_to_server` at `application/controllers/Caldav.php:60` hands the request's `caldav_url` to a Guzzle `REPORT` call without scheme or host validation. A logged-in backend user (admin, provider, or secretary) reaches loopback, RFC1918, and link-local hosts on the deployment's network. The Guzzle exception path returns the upstream status code plus ~120 bytes of response body in the JSON `message` field (`Caldav.php:74-78`), so the SSRF is semi-blind. Version 1.6.0 contains a patch.

Affected products

• Alextselegidis Easyappointments: before 1.6.0 (fixed in 1.6.0)

Published 2026-07-14. Last modified 2026-07-15.