Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| wpmudev | Appointments | < 2.2.2 | 2.2.2 |