Unrated severityNVD Advisory· Published Oct 18, 2025· Updated Apr 8, 2026

Appointments <= 2.2.1 - Unauthenticated PHP Object Injection

CVE-2017-20206

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

priyanshumittal/Appointmentllm-fuzzy
Range: <=2.2.1
wpmudev/Appointmentsv5
Range: 0

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

plugins.trac.wordpress.org/changeset/1733186/appointmentsmitre
www.wordfence.com/blog/2017/10/3-zero-day-plugin-vulnerabilities-exploited-wild/mitre
www.wordfence.com/threat-intel/vulnerabilities/id/7e8f230e-3f96-4efd-806d-72725b960303mitre

News mentions

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