Online Scheduling and Appointment Booking System <= 28.1 - Insecure Direct Object Reference to Unauthenticated Sensitive Data Access and Message Injection via 'conversation_id' Parameter
| CVE | CVE-2026-89063 |
|---|---|
| CVSS | 7.5 (High) |
| Publicly Published | September 15, 2026 |
| Last Updated | September 16, 2026 |
| Researcher |
jtb75
- NG20 LLC
|
Description
The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 28.1 via the 'conversation_id' parameter due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to read the full AI booking conversation transcript of any customer — leaking names, email addresses, phone numbers, and appointment details echoed by the assistant — and inject arbitrary messages into any victim conversation that are subsequently replayed to the Cloud AI worker along with the full private history. Because AI conversations are stored with no owner, user, or session identifier and conversation IDs are sequential integers, an unauthenticated attacker can enumerate all customer conversations simply by incrementing the conversation_id parameter.
References
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
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Vulnerability Details for Online Scheduling and Appointment Booking System – Bookly
| Software Type | Plugin |
|---|---|
| Software Slug | bookly-responsive-appointment-booking-tool (view on wordpress.org) |
| Patched? | Yes |
| Remediation | Update to version 28.2, or a newer patched version |
| Affected Version |
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| Patched Version |
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Recent vulnerabilities in Online Scheduling and Appointment Booking System – Bookly
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