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OpenAdvisories
High · 7.2 CVE-2026-8143 EUVD-2026-32106GHSA-j6cw-vh4x-xqjh

Booking Calendar – Event Calendar <= 2.1.6 - Unauthenticated Stored Cross-Site Scripting via Multiple Parameters

Published May 27, 2026 · Updated May 27, 2026 · Assigned by Wordfence

Description

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

VendorProductAffectedFixed
omnivo Booking Calendar – Event Calendar ≤ 2.1.6 —

References