CVE-2026-8143: Omnivo Booking Calendar – Event Calendar

High severity, CVSS 7.2. EPSS: 0.3% chance of exploitation in the next 30 days.

The HBook plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'hb_country_iso', 'hb_usa_state_iso', and 'hb_canada_province_iso' parameters in all versions up to, and including, 2.1.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page (the HBook Customers admin page).

Affected products

• Omnivo Booking Calendar – Event Calendar: up to and including 2.1.6

Published 2026-05-27. Last modified 2026-06-17.