CVE-2026-5465: Ameliabooking Booking For Appointments And Events Calendar – Amelia

High severity, CVSS 8.8. EPSS: 0.6% chance of exploitation in the next 30 days.

The Booking for Appointments and Events Calendar – Amelia plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 2.1.3. This is due to the `UpdateProviderCommandHandler` failing to validate changes to the `externalId` field when a Provider (Employee) user updates their own profile. The `externalId` maps directly to a WordPress user ID and is passed to `wp_set_password()` and `wp_update_user()` without authorization checks. This makes it possible for authenticated attackers, with Provider-level (Employee) access and above, to take over any WordPress account — including Administrator — by injecting an arbitrary `externalId` value when updating their own provider profile.

Affected products

• Ameliabooking Booking For Appointments And Events Calendar – Amelia: up to and including 2.1.3

Published 2026-04-07. Last modified 2026-06-17.