CVE-2026-18315
CriticalCVSS 9.8Summary
The TrueBooker – Appointment Booking and Scheduler System plugin for WordPress (up to and including 1.2.6) is vulnerable to Authorization Bypass Through User-Controlled Key leading to Account Takeover. The admin_user_create_cus AJAX handler lacks authentication or capability checks, allowing unauthenticated attackers to overwrite the email address of any user, including an administrator, and then use the standard lost-password flow to fully take over the account.
Risk Assessment
An attacker can take over an administrator account, leading to full compromise of the WordPress site.
Recommendation
Update the plugin to the latest version that fixes this issue.
Original NVD description (English source)
The TrueBooker – Appointment Booking and Scheduler System plugin for WordPress is vulnerable to Authorization Bypass Through User-Controlled Key leading to Account Takeover in all versions up to, and including, 1.2.6. This is due to the admin_user_create_cus AJAX handler lacking any authentication or capability check before passing the attacker-supplied truebooker_wp_user_id parameter directly to wp_update_user. This makes it possible for unauthenticated attackers to overwrite the email address of any WordPress user — including an administrator — and then complete the standard WordPress lost-password flow to fully take over the targeted account.