The Easy Appointments plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 3.12.27 via the handlecustomersajax. This makes it possible for authenticated attackers, with contributor-level access and above, to extract the full customer dataset from the eacustomers table, including personally identifiable information such as names, email addresses, mobile numbers, dates of birth, and physical addresses.

The Easy Appointments WordPress plugin before 4.0.2.2 does not perform an ownership or authorization check on its unauthenticated appointment-reservation endpoint before updating an existing appointment identified by a request-supplied id, allowing unauthenticated attackers to overwrite, and through a follow-on cleanup delete, arbitrary appointments.

The Easy Appointments WordPress plugin before 3.12.28 does not verify ownership or capability when returning stored customer details, allowing users with subscriber-level access to read any customer's personal information by iterating an identifier.

Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in Easy Appointments Easy Appointments easy-appointments allows Code Injection.This issue affects Easy Appointments: from n/a through <= 3.12.14.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Nikola Loncar Easy Appointments allows Stored XSS.This issue affects Easy Appointments: from n/a through 3.10.7.