Description
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.
References5
- plugins.trac.wordpress.org/browser/hydra-booking/trunk/admin/Co…
- plugins.trac.wordpress.org/browser/hydra-booking/trunk/admin/Co…
- plugins.trac.wordpress.org/browser/hydra-booking/trunk/app/Cont…
- plugins.trac.wordpress.org/changeset?reponame=&old=3632543%40hy…
- www.wordfence.com/threat-intel/vulnerabilities/id/8331fe3f-e943…
Metrics
- CVSS 3.1
-
6.4
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 30 · as of 12 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.