CVE-2026-52840: low-severity vulnerability in alextselegidis easyappointments
Easy!Appointments has server-side request forgery in CalDAV connection test that exposes the deployment's internal network
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
8Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 2.7epss 0.2%
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.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Affected products
alextselegidis · easyappointmentsRelated CVEs — alextselegidis easyappointments
In the same product, most dangerous first.
CVE-2026-52837MEDIUMEasy!Appointments has unauthenticated customer PII disclosure on booking reschedule pageEPSS 0.5%CVE-2026-108758HIGHEasy!Appointments through 1.6.0 Authorization Bypass via booking/register EndpointEPSS 0.3%CVE-2026-23622HIGHCSRF Protection Bypass: Sensitive endpoints accept GET requests, enabling admin account takeoverEPSS 0.2%CVE-2026-55651HIGHEasy!Appointments Vulnerable to Appointments Takeover via Excessive Data ExposureEPSS 0.2%CVE-2026-52838LOWEasy!Appointments disable_booking_message rendered as raw HTML on public booking page — Stored XSSEPSS 0.2%CVE-2026-52841LOWEasy!Appointments: Authorization bypass in Google OAuth provider binding lets any backend user rebind a peer provider's Google syncEPSS 0.2%