Risk Letters

Exploited vulnerability

CVE-2026-18315

TLP:CLEAR

Authorization Bypass Through User-Controlled Key

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.

Facts

  • Vendor: themetechmount
  • Product: TrueBooker – Appointment Booking and Scheduler System
  • EPSS (probability of exploitation within 30 days): 3 %
  • First known exploitation: 13 October 2026
  • First seen by Risk Letters: 13 October 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD