CVE-2017-20206

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CVSS 3.1

9.8 critical

EPSS

<1%p51

Published

Oct 18, 2025 (Oct 18, 2025)

Modified

Jun 17, 2026

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.

Vendors: wpmudev
Products: appointments
Ecosystems: WordPress
Weakness: CWE-502
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.7%)

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