low2.7
CVE-2026-52840
Easy!Appointments has server-side request forgery in CalDAV connection test that exposes the deployment's internal network
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | alextselegidis/easyappointments | <= 1.5.2 | none recorded |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-pm5p-7w5h-jm5q
- https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-pm5p-7w5h-jm5q
- https://nvd.nist.gov/vuln/detail/CVE-2026-52840
- https://github.com/alextselegidis/easyappointments/commit/2da2baed18ec32ad7916e507815709c8f010d510
- https://github.com/alextselegidis/easyappointments/commit/4abb10545d83ac1a57d03f6502376ee67696ea7c
- https://github.com/alextselegidis/easyappointments/commit/6b34b78c47790dfd1dec27cf62926db51be276e9
- https://github.com/alextselegidis/easyappointments/commit/6eb9336a91cfb276379506625e81f5bd9ed3a536
- https://github.com/alextselegidis/easyappointments/releases/tag/1.6.0