Roxnor Rox Appointment Booking Plugin up to 1.3.1 on WordPress Mass Assignment booking handleRequest wp_user_id dynamically-determined object attributes

Summaryinfo

A vulnerability was found in Roxnor Rox Appointment Booking Plugin up to 1.3.1. It has been declared as critical. This impacts the function SaveCustomer::handleRequest of the file /rox-appointment-booking/v1/public/booking of the component Mass Assignment. Executing a manipulation of the argument wp_user_id can lead to dynamically-determined object attributes. This vulnerability is handled as CVE-2026-104012. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical was found in Roxnor Rox Appointment Booking Plugin up to 1.3.1. This vulnerability affects the function SaveCustomer::handleRequest of the file /rox-appointment-booking/v1/public/booking of the component Mass Assignment. The manipulation of the argument wp_user_id with an unknown input leads to a dynamically-determined object attributes vulnerability. The CWE definition for the vulnerability is CWE-915. The product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The Rox Appointment Booking – Appointment Booking Scheduling Solution plugin for WordPress is vulnerable to Privilege Escalation via Mass Assignment in all versions up to, and including, 1.3.1 This is due to the public `/rox-appointment-booking/v1/public/booking` REST endpoint performing mass-assignment of the raw request body into a new customer row while `CustomerModel::$fillable` includes the internal `wp_user_id` column, allowing an unauthenticated attacker to persist an arbitrary WordPress user ID alongside an attacker-controlled email address with no authorization check. When an administrator subsequently opens the poisoned customer record and clicks Update Customer, `SaveCustomer::handleRequest()` passes the stored `wp_user_id` and attacker-supplied email to `wp_update_user()` — succeeding because `LinkedAccount::canChange()` unconditionally returns true when the acting user holds the `edit_users` capability — thereby overwriting the targeted administrator's email address and enabling full account takeover via a standard WordPress password-reset request. Successful exploitation requires an administrator to open and save the poisoned record, and the attacker must know or guess a valid administrator user ID (such as the default user ID 1).

The advisory is available at wordfence.com. This vulnerability was named CVE-2026-104012 since 10/01/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/31/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Vendor

• Roxnor

Name

• Rox Appointment Booking Plugin

Version

• 1.3.0
• 1.3.1

CPE 2.3info

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CPE 2.2info

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