Description
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.
References5
- plugins.svn.wordpress.org/truebooker-appointment-booking/tags/1…
- plugins.svn.wordpress.org/truebooker-appointment-booking/tags/1…
- plugins.svn.wordpress.org/truebooker-appointment-booking/tags/1…
- plugins.trac.wordpress.org/changeset/3640018/truebooker-appoint…
- www.wordfence.com/threat-intel/vulnerabilities/id/73251a74-5be3…
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 3% percentile: 88 · as of 10 November 2026
- CWE
- CWE-639
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.