What the vulnerability does
01Description
The Appointment Hour Booking – Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via form field configuration parameters in all versions up to, and including, 1.5.60 due to insufficient input sanitization and output escaping on the 'Min length/characters' and 'Max length/characters' field configuration values. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses the form builder interface. This only affects multi-site installations and installations where unfiltered_html has been disabled.
Explanation of Vulnerability in Simple Terms
02Summary
Appointment Hour Booking contains a cross-site scripting (XSS) vulnerability in versions up to 1.5.60. An authenticated administrator with high privileges can inject malicious scripts that affect other users or the site scope. The vulnerability requires specific conditions to exploit and has limited impact on confidentiality and integrity.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers or affect site functionality.
Potential impact on your site
04Site Impact
Administrators could be tricked into executing malicious scripts affecting site security and user data.
Conditions required to exploit
05Prerequisites
Attacker must have high-level administrative privileges and specific attack conditions must be met.
Key dates
06Disclosure timeline
January 28, 2026
CVE published
April 8, 2026
Record updated
