alextselegidis easyappointments up to 1.5.x Booking index.php index appointment_hash information disclosure

Summaryinfo

A vulnerability classified as problematic was found in alextselegidis easyappointments up to 1.5.x. Affected is the function index of the file index.php of the component Booking. Executing a manipulation of the argument appointment_hash can lead to information disclosure. This vulnerability is tracked as CVE-2026-52837. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in alextselegidis easyappointments up to 1.5.x. It has been declared as problematic. This vulnerability affects the function index of the file index.php of the component Booking. The manipulation of the argument appointment_hash with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

Easy!Appointments is a self hosted appointment scheduler. In versions up to and including 1.5.2, the booking reschedule view at `/index.php/booking/reschedule/{appointment_hash}` (handled by `Booking::index()`) embeds the entire customer record as inline JavaScript (`const vars = {... "customer_data": {...}, ...}`) without authentication and without field whitelisting. Anyone in possession of the 12-character `appointment_hash` — which appears in plain text in reschedule emails, confirmation page URLs, and operator-side calendar links — can read every column of that customer's row in the `ea_users` table. Version 1.6.0 contains a patch.

The advisory is available at github.com. This vulnerability was named CVE-2026-52837 since 06/08/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

By approaching the search of inurl:index.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 1.6.0 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Appointment Software

Vendor

• alextselegidis

Name

• easyappointments

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5

Website

• Product: https://github.com/alextselegidis/easyappointments/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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