Vulnerability 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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://plugins.svn.wordpress.org/truebooker-appointment-booking/tags/1.2.6/main
- https://plugins.svn.wordpress.org/truebooker-appointment-booking/tags/1.2.6/main
- https://plugins.svn.wordpress.org/truebooker-appointment-booking/tags/1.2.6/temp
- https://plugins.trac.wordpress.org/changeset/3640018/truebooker-appointment-book
- https://www.wordfence.com/threat-intel/vulnerabilities/id/73251a74-5be3-446b-8e0
FAQ
What is CVE-2026-18315?
CVE-2026-18315 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 ...
How severe is CVE-2026-18315?
CVE-2026-18315 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-18315?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.