Bookly 23.2 - 28.2 - Authenticated (Bookly Administrator+) PHP Object Injection

The Bookly plugin for WordPress is vulnerable to PHP Object Injection in versions 23.2 through 28.2. This is due to deserialization of untrusted input. This makes it possible for authenticated attackers, with bookly administrator-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.

An attacker needs Bookly Administrator access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: Online Scheduling and Appointment Booking System 28.3 closes this, and updating the plugin is the step that ends it.

• Firewall
• Scanner
• Alerts