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CVE-2026-8143— Booking Calendar – Event Calendar <= 2.1.6 - Unauthenticated Stored Cross-Site Scripting via Multiple Parameters

Quick assessment

Affected
omnivo Booking Calendar – Event Calendar
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin HBook 2.1.6及之前版本存在跨站脚本漏洞，该漏洞源于输入清理和输出转义不足，可能导致未经身份验证的攻击者通过hb_country_iso、hb_usa_state_iso和hb_canada_province

CVSS 7.2 · High EPSS 0.19% · P9

Affected Version Matrix 1

VendorProduct Version RangeStatus
omnivo Booking Calendar – Event Calendar ≤ 2.1.6 affected
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I. Basic Information for CVE-2026-8143

Vulnerability Information
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Vulnerability Title
Booking Calendar – Event Calendar <= 2.1.6 - Unauthenticated Stored Cross-Site Scripting via Multiple Parameters
Source: CVE Program / CVE List V5
Vulnerability 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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin HBook 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin HBook 2.1.6及之前版本存在跨站脚本漏洞，该漏洞源于输入清理和输出转义不足，可能导致未经身份验证的攻击者通过hb_country_iso、hb_usa_state_iso和hb_canada_province
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
omnivo Booking Calendar – Event Calendar 0 ~ 2.1.6 -

II. Public POCs for CVE-2026-8143

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III. Intelligence Information for CVE-2026-8143

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Other References for CVE-2026-8143 (1)

IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-8143

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