PT-2026-43572 · Omnivo · Booking Calendar – Event Calendar

Hung Nguyen · Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-8143

NVD

CVSS v3.1

7.2

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

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).

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-8143

Affected Products

Booking Calendar – Event Calendar

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-8143 · Security Note
• https://wordfence.com/threat-intel/vulnerabilities/id/e1c16bcb-c188-4e01-9d0b-e4e1a1ef82ee?source=cve · Note
• https://codecanyon.net/item/hbook-hotel-booking-system-wordpress-plugin/15059946 · Note