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.

INFO

Published Date :

2025-10-18T03:33:24.194Z

Last Modified :

2026-04-08T17:03:10.542Z

Source :

Wordfence
AFFECTED PRODUCTS

The following products are affected by CVE-2017-20206 vulnerability.

Vendors Products
Wordpress
  • Wordpress
Wpmudev
  • Appointments
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2017-20206.

URL Resource
https://plugins.trac.wordpress.org/changeset/1733186/appointments cve-icon cve-icon
https://www.wordfence.com/blog/2017/10/3-zero-day-plugin-vulnerabilities-exploited-wild/ cve-icon cve-icon
https://www.wordfence.com/threat-intel/vulnerabilities/id/7e8f230e-3f96-4efd-806d-72725b960303?source=cve cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact