Online Scheduling and Appointment Booking System <= 27.7 - Unauthenticated Stored Cross-Site Scripting via bookly_speed_up_update_addons AJAX action
| CVE | CVE-2026-13424 |
|---|---|
| CVSS | 7.2 (High) |
| Publicly Published | August 15, 2026 |
| Last Updated | August 16, 2026 |
| Researcher |
Dmitrii Ignatyev
- CleanTalk Inc
|
Description
The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to Stored Cross-Site Scripting via bookly_speed_up_update_addons AJAX action in all versions up to, and including, 27.7 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 injection point is the bookly_speed_up_update_addons AJAX action, which is registered as wp_ajax_nopriv_* and therefore reachable without authentication; the payload is stored verbatim in the bookly_log.details column when a request is submitted without a valid signature, and executes when an administrator later views the Diagnostics → Logs page.
Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.
References
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
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Vulnerability Details for Online Scheduling and Appointment Booking System – Bookly
| Software Type | Plugin |
|---|---|
| Software Slug | bookly-responsive-appointment-booking-tool (view on wordpress.org) |
| Patched? | Yes |
| Remediation | Update to version 28.0, or a newer patched version |
| Affected Version |
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| Patched Version |
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Recent vulnerabilities in Online Scheduling and Appointment Booking System – Bookly
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