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CVE-2026-18315

CRITICAL 9.8 CVSS 3.1
Published
August 19, 2026
Last modified
August 21, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-639
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Affected WordPress components

  • TrueBooker – Appointment Booking and Scheduler System Plugin · truebooker-appointment-booking
    Confirmed match Active
    Up to and including 1.2.6
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • themetechmount TrueBooker – Appointment Booking and Scheduler System — Up to and including 1.2.6

References

  • plugins.svn.wordpress.org https://plugins.svn.wordpress.org/truebooker-appointment-booking/tags/1.2.6/main/config/truebooker-style.php
  • plugins.svn.wordpress.org https://plugins.svn.wordpress.org/truebooker-appointment-booking/tags/1.2.6/main/function_ajax.php
  • plugins.svn.wordpress.org https://plugins.svn.wordpress.org/truebooker-appointment-booking/tags/1.2.6/templates/login-register.php
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset/3640018/truebooker-appointment-booking
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/73251a74-5be3-446b-8e0a-ff2d1484c467?source=cve
  • nvd.nist.gov Official NVD record