The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 28.2 via deserialization of untrusted input via the ‘value’ parameter. This makes it possible for authenticated attackers, with custom-level access and above, to inject a PHP Object. No known gadget chain is available.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
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