What the vulnerability does
01Description
The TrueBooker plugin for WordPress is vulnerable to Account Takeover in all versions up to, and including, 1.2.6. This is due to the add_front_user_update() AJAX handler being registered for unauthenticated users and accepting an arbitrary truebooker_wp_user_id value, which is passed directly to wp_update_user() without verifying authentication or ownership. This makes it possible for unauthenticated attackers to change any WordPress user account email address, including an administrator, by submitting the target user ID and an attacker-controlled email address. An attacker can then use the native WordPress password reset flow to receive the reset link at the attacker-controlled email address and take over the account.
Explanation of Vulnerability in Simple Terms
02Summary
TrueBooker versions 1.2.6 and earlier contain an authorization bypass vulnerability in how the system validates user-controlled identifiers. An attacker can manipulate booking or user IDs to access, modify, or delete appointments and data belonging to other users without authentication. This affects all confidentiality, integrity, and availability of the booking system.
What an attacker can do
03Attacker Capabilities
Access, modify, or delete any appointment or user data in the system without logging in.
Potential impact on your site
04Site Impact
Attackers can view, change, or erase all bookings and customer information; complete compromise of booking data integrity.
Conditions required to exploit
05Prerequisites
Network access to the TrueBooker installation; no authentication or user interaction required.
Key dates
06Disclosure timeline
August 15, 2026
CVE published
August 17, 2026
Record updated
