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).

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Fixes

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Workaround

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History

Wed, 27 May 2026 11:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 27 May 2026 10:30:00 +0000

Type Values Removed Values Added
First Time appeared Omnivo
Omnivo booking Calendar – Event Calendar
Wordpress
Wordpress wordpress
Vendors & Products Omnivo
Omnivo booking Calendar – Event Calendar
Wordpress
Wordpress wordpress

Wed, 27 May 2026 08:00:00 +0000

Type Values Removed Values Added
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).
Title Booking Calendar – Event Calendar <= 2.1.6 - Unauthenticated Stored Cross-Site Scripting via Multiple Parameters
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published:

Updated: 2026-05-27T10:29:00.472Z

Reserved: 2026-05-07T20:39:17.716Z

Link: CVE-2026-8143

cve-icon Vulnrichment

Updated: 2026-05-27T10:28:55.445Z

cve-icon NVD

Status : Received

Published: 2026-05-27T08:16:45.317

Modified: 2026-05-27T08:16:45.317

Link: CVE-2026-8143

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-27T10:06:39Z

Weaknesses