The Hydra Booking — Appointment Scheduling & Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'first_name' parameter in all versions up to, and including, 1.2.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with host-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The tfhb_host role required to exploit this vulnerability can be self-assigned by any visitor via the plugin's public Signup shortcode, making this effectively exploitable by unauthenticated users who complete the registration flow.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Hydra Booking Plugin | — | Update hydra-booking plugin to version 1.2.3, or a newer patched version | Aug 17, 2026 | Aug 14, 2026 |
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