What the vulnerability does
01Description
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.
Explanation of Vulnerability in Simple Terms
02Summary
Hydra Booking versions up to 1.2.2 contain a cross-site scripting vulnerability that allows authenticated users to inject malicious scripts affecting other users across the site. An attacker with low-level access can craft input that executes in other users' browsers, potentially stealing session data or performing actions on their behalf. The vulnerability has a changed scope, meaning the impact extends beyond the vulnerable component itself.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers and affect site functionality.
Potential impact on your site
04Site Impact
Authenticated users can compromise other users' sessions or perform unauthorized actions across your booking system.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege account on the site; no user interaction required from victims.
Key dates
06Disclosure timeline
August 15, 2026
CVE published
