CVE-2017-20206
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-18

Last updated on: 2025-12-23

Assigner: Wordfence

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.
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Meta Information
Published
2025-10-18
Last Modified
2025-12-23
Generated
2026-06-16
AI Q&A
2025-10-18
EPSS Evaluated
2026-06-14
NVD
CVE-2017-20206
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
wpmudev appointments to 2.2.1 (inc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-502 The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
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Executive Summary

This vulnerability exists in the Appointments plugin for WordPress versions up to 2.2.1. It is a PHP Object Injection flaw caused by deserialization of untrusted input from the 'wpmudev_appointments' cookie. This allows unauthenticated attackers to inject malicious PHP objects, which can be exploited to create backdoors using the WP_Theme() class.

Impact Analysis

The vulnerability can have severe impacts including unauthorized remote code execution, allowing attackers to create backdoors on the affected system. This can lead to full compromise of the WordPress site, data theft, site defacement, or further attacks on the hosting environment.

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