CVE-2026-52839

Easy!Appointments through 1.6.0 contains an authorization bypass vulnerability in Booking::register() that allows unauthenticated attackers to modify any appointment by supplying an appointment id without its hash. Attackers can enumerate sequential appointment ids with a self-asserted manage_mode flag to rewrite appointment details, rebind them to attacker-controlled customers, and obtain management hashes for rescheduling or cancellation.

The Easy Appointments plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to and including 3.12.27 via the handle_customers_ajax. This allows authenticated attackers with contributor-level access and above to extract the full customer dataset from the ea_customers 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 4.0.2.2 does not use an unguessable token to authorize its mail-link appointment cancellation and confirmation action, deriving the token from a hardcoded source-embedded salt and the appointment's creation timestamp, so unauthenticated attackers who know or guess that timestamp can cancel or confirm arbitrary appointments.

DOM-Based Cross Site Scripting (XSS) vulnerability in Easy Appointments versions up to 4.0.2.1. Allows an attacker to manipulate the DOM of the page in the victim's browser, leading to execution of malicious script.

A vulnerability in the Easy Appointments WordPress plugin before 3.12.28 incorrectly validates shortcode input, allowing contributor-level users to execute arbitrary registered shortcodes.

The Easy Appointments WordPress plugin before 3.12.28 does not require a sufficient capability on one of its appointment-listing REST endpoints, restricting it only to a capability that every authenticated user holds, allowing users with subscriber-level access to read all bookings on the site, including customer names, schedules, and statuses.

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.

A vulnerability in the Easy Appointments WordPress plugin before 3.12.28 lacks capability and nonce checks in a connection-deletion action, allowing contributor-level users to delete booking configuration and disable the booking system.

A vulnerability in the Easy Appointments WordPress plugin through 4.0 lacks capability checks in appointment-management actions, relying only on a nonce, allowing contributor-level users to read all customers' appointment details and to create, modify, and delete bookings.