CVE-2017-20206Appointments <= 2.2.1 - Unauthenticated PHP Object Injection
Updated under an hour ago ()
Does this affect you?
It affects wpmudev Appointments. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-502
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Wordfence
- NVD analysis
- Analyzed
- Record last updated
- Apr 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
wpmudev Appointments wpmudev:appointments (from the name) | before 2.2.2 | CNA record |
wpmudev appointments wpmudev:appointments | through 2.2.1 | NVD |
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/7e8f230e-3f96-4efd-806d-72725b960303?source=cvethird-party-advisory
- https://www.wordfence.com/blog/2017/10/3-zero-day-plugin-vulnerabilities-exploited-wild/press/media-coverage, third-party-advisory
- https://plugins.trac.wordpress.org/changeset/1733186/appointmentspatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.