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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.

PUBLISHED Reserved 2025-10-17 | Published 2025-10-18 | Updated 2025-10-18 | Assigner Wordfence




CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-502 Deserialization of Untrusted Data

Product status

Default status
unaffected

* before 2.2.2
affected

Timeline

2017-10-02:Disclosed

Credits

Matt Barry finder

References

www.wordfence.com/...-3f96-4efd-806d-72725b960303?source=cve

www.wordfence.com/...-plugin-vulnerabilities-exploited-wild/

plugins.trac.wordpress.org/changeset/1733186/appointments

cve.org (CVE-2017-20206)

nvd.nist.gov (CVE-2017-20206)

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