CVE-2026-1856
MediumCVSS 6.4Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
The Appointment Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) via custom booking field labels in all versions up to and including 1.4.4 due to insufficient input sanitization and output escaping.
Risk Assessment
Authenticated attackers with Author-level access and above can inject arbitrary web scripts that will execute whenever a user accesses an injected page, potentially leading to data theft or account takeover.
Recommendation
It is recommended to update the plugin to the latest version to mitigate this vulnerability and implement additional security measures such as monitoring user activity.
Other vulnerabilities in Appointment Booking Calendar plugin for WordPress
See all- CVE-2015-7319High
The Appointment Booking Calendar plugin for WordPress before version 1.1.8 contains an SQL injection vulnerability in the cpabc_appointments_admin_int_calendar_list.inc.php file. This allows remote attackers to execute arbitrary SQL commands via unspecified vectors related to updating the username.
- CVE-2026-12111Medium
The Appointment Booking Calendar plugin for WordPress is vulnerable to Sensitive Information Exposure in versions up to 1.4.01. This is due to insufficient authorization and missing per-calendar ownership checks in the cpabc_appointments_calendar_load2() function.
Original NVD description (English source)
The Appointment Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via custom booking field labels in all versions up to, and including, 1.4.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.