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The Appointments plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 2.2.1 via deserialization of untrusted input from the `wpmudev_appointments` cookie. This allows unauthenticated attackers to inject a PHP Object. Attackers were actively exploiting this vulnerability with the WP_Theme() class to create backdoors.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Appointments Plugin | — | Update appointments plugin to version 2.2.2, or a newer patched version | Oct 21, 2025 | Oct 2, 2017 |
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