CVE-2026-9188The 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 `appointm…
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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.
- CVSS
- 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-639
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Deferred
- Record last updated
- Jul 2, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
No affected products are listed yet.
References
- https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.5/app/Models/Client.php#L39
- https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.5/app/Services/AppointmentNew.php#L190
- https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.5/app/Services/AppointmentNew.php#L347
- https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.5/app/Services/AppointmentNew.php#L40
- https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.6/app/Models/Client.php#L39
- https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.6/app/Services/AppointmentNew.php#L190
- https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.6/app/Services/AppointmentNew.php#L347
- https://plugins.trac.wordpress.org/browser/wappointment/tags/2.7.6/app/Services/AppointmentNew.php#L40
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3546313%40wappointment&new=3546313%40wappointment&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/07069f39-f892-4c19-8e0b-e5e17b1ffb21?source=cve
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.