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CVE-2026-9188

MEDIUM 5.3 CVSS 3.1
Published
July 2, 2026
Last modified
July 2, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-639
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Description

The Appointment Bookings for Zoom GoogleMeet and more – Wappointment plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to and including 2.7.6 via the `appointmentkey` parameter due to the appointment `edit_key` — the sole authorization token consumed by `tryCancel()` — being generated as a predictable, unsalted MD5 hash of only `client_id` (a sequential integer), `start_at` (a publicly observable appointment timestamp), and `staff_id` (a small enumerable integer), with no secret salt or random component, and the unauthenticated cancellation and rescheduling REST endpoints performing no ownership or identity verification beyond matching this reconstructible key. This makes it possible for unauthenticated attackers to compute valid `edit_key` values for appointments belonging to other users and cancel or reschedule those appointments arbitrarily. Exploitation requires the `allow_cancellation` or `allow_rescheduling` setting to be enabled on the site, both of which are common configurations for active booking deployments; an attacker can obtain the inputs needed to reconstruct a victim's key by booking their own appointment to observe their sequential `client_id` and correlating publicly visible appointment times and enumerable staff identifiers.

Affected WordPress components

  • Appointment Bookings for Zoom GoogleMeet and more – Wappointment Plugin · wappointment
    Confirmed match Active
    Up to and including 2.7.6
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • wappointment Appointment Bookings for Zoom GoogleMeet and more – Wappointment — Up to and including 2.7.6

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.5/app/Models/Client.php#L39
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.5/app/Services/AppointmentNew.php#L190
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.5/app/Services/AppointmentNew.php#L347
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.5/app/Services/AppointmentNew.php#L40
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.6/app/Models/Client.php#L39
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.6/app/Services/AppointmentNew.php#L190
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.6/app/Services/AppointmentNew.php#L347
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.6/app/Services/AppointmentNew.php#L40
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3546313%40wappointment&new=3546313%40wappointment&sfp_email=&sfph_mail=
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/07069f39-f892-4c19-8e0b-e5e17b1ffb21?source=cve
  • nvd.nist.gov Official NVD record