CVE-2026-13424 Cross-site scripting in Online Scheduling and Appointment Booking System – Bookly
Unauthenticated attackers can inject arbitrary scripts via an AJAX action, leading to code execution when administrators view logs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-13424?
CVE-2026-13424 is a high-severity cross-site scripting vulnerability in ladela Online Scheduling and Appointment Booking System – Bookly, published on 16 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-13424?
How do I fix CVE-2026-13424?
No fix has been published for CVE-2026-13424 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-13424 being exploited?
There is no known exploitation of CVE-2026-13424 in the wild and no public exploit code.
Sources
Also known as GHSA-q2ch-2q4j-vq6h.