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CVE-2026-18315 – Unauthenticated Admin Account Takeover – TrueBooker WordPress Plugin (≤ 1.2.6)

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Summary

CVE-2026-18315 is a critical authorization bypass vulnerability (CWE-639) in the TrueBooker – Appointment Booking and Scheduler System plugin for WordPress. It allows unauthenticated attackers to overwrite the email address of any WordPress user, including administrators, ultimately enabling full account takeover. The flaw carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: the plugin’s admin_user_create_cus AJAX handler performs no authentication or capability checks before processing user-supplied input.
  • Trigger condition: an attacker submits a request to the AJAX handler with a truebooker_wp_user_id parameter pointing to an arbitrary WordPress user ID; the value is passed directly to wp_update_user, changing that account’s email address.
  • Attack vector: network-based, requires no authentication and no user interaction.
  • Impact: after redirecting a victim’s registered email to an attacker-controlled address, the attacker can trigger the standard WordPress password reset flow to seize control of the account, including administrator accounts, resulting in complete compromise of confidentiality, integrity, and availability.

Affected software

  • TrueBooker – Appointment Booking and Scheduler System (WordPress plugin) — versions up to and including 1.2.6

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade the TrueBooker plugin to a patched version above 1.2.6 as soon as it is made available by the vendor.
  • If no patch is available: Deactivate and remove the TrueBooker plugin from production WordPress sites until a fixed version is confirmed.
  • Additional hardening: Monitor WordPress user account email changes and password reset requests for unexpected activity, and enforce multi-factor authentication on administrator accounts where possible.

References

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