Vulnerability Database

319,478

Total vulnerabilities in the database

CVE-2017-20206

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.

  • Published: Oct 18, 2025
  • Updated: Nov 9, 2025
  • CVE: CVE-2017-20206
  • Severity: Critical
  • Exploit:

CVSS v3:

  • Severity: Critical
  • Score: 9.8
  • AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWEs:

OWASP TOP 10:

Software From Fixed in
wpmudev / appointments - 2.2.1.x