The Appointment Hour Booking – Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via form field configuration parameters in all versions up to, and including, 1.5.60 due to insufficient input sanitization and output escaping on the 'Min length/characters' and 'Max length/characters' field configuration values. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses the form builder interface. This only affects multi-site installations and installations where unfiltered_html has been disabled.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Appointment Hour Booking Plugin | — | Update appointment-hour-booking plugin to version 1.5.61, or a newer patched version | Jan 28, 2026 | Jan 27, 2026 |
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