CVE-2026-18315 Auth bypass in TrueBooker – Appointment Booking and Scheduler System
Unauthenticated attackers can bypass authorization to overwrite user emails and take over accounts, including administrators, in the TrueBooker WordPress plugin.
- 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-2026-18315?
CVE-2026-18315 is a critical authentication bypass vulnerability in themetechmount TrueBooker – Appointment Booking and Scheduler System, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-639
Which versions are affected by CVE-2026-18315?
How do I fix CVE-2026-18315?
No fix has been published for CVE-2026-18315 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-2026-18315 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18315 exists.
Public exploit code: 1 Nuclei template and 1 proofs of concept on GitHub.
Sources
Also known as GHSA-7xx3-2cj6-229w.