What is CVE-2026-52840?

CVE-2026-52840 is a low-severity vulnerability in Alextselegidis Easyappointments, classified under Server-Side Request Forgery (SSRF). CVSS score: 2.7/10. Published 2026-07-14.

How severe is CVE-2026-52840?

Low severity. CVSS v3 base score is 2.7 out of 10.

SSRF in Alextselegidis Easyappointments

CVE-2026-52840

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.003 (23.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 2.7 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N.

Affected products

Alextselegidis Easyappointments — versions < 1.6.0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-52840?: CVE-2026-52840 is a low-severity vulnerability in Alextselegidis Easyappointments, classified under Server-Side Request Forgery (SSRF). CVSS score: 2.7/10. Published 2026-07-14.
How severe is CVE-2026-52840?: Low severity. CVSS v3 base score is 2.7 out of 10.