CVE-2026-16142 Auth bypass in TrueBooker – Appointment Booking and Scheduler System
Unauthenticated attackers can take over any WordPress account, including administrators, by modifying user email addresses via an insecure AJAX handler.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-16142?
CVE-2026-16142 is a critical authentication bypass vulnerability in themetechmount TrueBooker – Appointment Booking and Scheduler System, published on 15 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-639
Which versions are affected by CVE-2026-16142?
How do I fix CVE-2026-16142?
No fix has been published for CVE-2026-16142 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-16142 being exploited?
There is no known exploitation of CVE-2026-16142 in the wild and no public exploit code.
Sources
Also known as GHSA-76x4-wpvp-whc4.