CVE-2026-52840 Details
Description
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.
A server-side request forgery (SSRF) vulnerability has been identified in Easy!Appointments versions prior to 1.6.0. The issue arises in the CalDAV connection testing feature, where the application controller `Caldav` improperly validates the `caldav_url` before using it in a Guzzle `REPORT` request. This flaw allows a logged-in backend user (admin, provider, or secretary) to access loopback, RFC1918, and link-local hosts within the deployment's network. Although the vulnerability is semi-blind, as it does not directly reveal the response body, the Guzzle exception handling exposes the upstream status code and a truncated version of the response in the JSON `message` field.
Users can update to Easy!Appointments version 1.6.0 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 14, 2026CISA-ADP
Assessed Jul 15, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-pm5p-7w5h-jm5q | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/alextselegidis/easyappointments/commit/6eb9336a91cfb276379506625e81f5bd9ed3a536 | [email protected] | Source CodeVendor |
| https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-pm5p-7w5h-jm5q | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Easy!Appointments | <= 1.5.2 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 15, 2026 | CVE Modified | CISA-ADP |
| Jul 14, 2026 | New CVE Received | [email protected] |