CVE-2026-5465

Description

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.

References

• https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Application/Commands/User/Provider/UpdateProviderCommandHandler.php#L146
• https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Application/Commands/User/Provider/UpdateProviderCommandHandler.php#L219
• https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Application/Commands/User/Provider/UpdateProviderCommandHandler.php#L239
• https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Application/Controller/User/Provider/UpdateProviderController.php#L30
• https://plugins.trac.wordpress.org/changeset/3499608/ameliabooking/trunk/src/Application/Commands/User/Provider/UpdateProviderCommandHandler.php