CVE-2025-12787 is a vulnerability in the Hydra Booking — Appointment Scheduling & Booking Calendar WordPress plugin caused by the use of insufficiently random values for booking cancellation tokens and a globally shared nonce. This flaw enables unauthenticated attackers to perform brute force attacks against the tfhb_meeting_form_cencel AJAX endpoint to cancel arbitrary bookings without permission. The issue affects all versions up to and including 1.1.27. The CVSS 3.1 base score is 5.3 (medium), reflecting network attack vector, low attack complexity, no privileges required, no user interaction, unchanged scope, no confidentiality or availability impact, but integrity impact due to unauthorized booking cancellations.

An attacker can cancel arbitrary bookings without authentication by exploiting weak randomness in cancellation tokens and a shared nonce. This compromises the integrity of booking data but does not affect confidentiality or availability. There are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix is currently referenced, users should monitor the vendor's communications for updates. Until a fix is available, consider restricting access to the AJAX endpoint or implementing additional validation controls to mitigate unauthorized booking cancellations.