CVE-2026-2519

Description

The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to price manipulation via the 'tips' parameter in all versions up to, and including, 27.0. This is due to the plugin trusting a user-supplied input without server-side validation against the configured price. This makes it possible for unauthenticated attackers to submit a negative number to the 'tips' parameter, causing the total price to be reduced to zero.

References

• https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/trunk/frontend/modules/booking/Ajax.php#L709
• https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/trunk/lib/CartInfo.php#L450
• https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/trunk/lib/UserBookingData.php#L355
• https://plugins.trac.wordpress.org/changeset/3480956/
• https://www.booking-wp-plugin.com/change-log/