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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 6
https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Applica…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Applica…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Applica…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Applica…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset/3499608/ameliabooking/trunk/src/Ap…
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/a4204099-1065-4167-8b…
security@wordfence.com