CVE-2026-15948: Themefic Hydra Booking — Appointment Scheduling & Booking Calendar

Medium severity, CVSS 6.4. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Themefic Hydra Booking — Appointment Scheduling & Booking Calendar: up to and including 1.2.2

Published 2026-08-15. Last modified 2026-08-20.