Online Scheduling and Appointment Booking System <= 28.1 - Insecure Direct Object Reference to Unauthenticated Sensitive Data Access and Message Injection via 'conversation_id' Parameter
Summary
| CVE | CVE-2026-89063 |
|---|---|
| State | PUBLISHED |
| Assigner | Wordfence |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-16 05:16:47 UTC |
| Updated | 2026-09-16 05:16:47 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Problem Types: CWE-639 | CWE-639 CWE-639 Authorization Bypass Through User-Controlled Key
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| 3.1 | CNA | DECLARED | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
NoneAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Ladela | Online Scheduling And Appointment Booking System Bookly | affected 28.1 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.wordfence.com/threat-intel/vulnerabilities/id/b6af015f-f954-4afb-9d65-56176... | [email protected] | www.wordfence.com | |
| plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.1/... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.1/... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.1/... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.1/... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.1/... | [email protected] | plugins.trac.wordpress.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: jtb75 (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-09-10T18:54:03.000Z | Vendor Notified |
| CNA | 2026-09-15T15:39:44.000Z | Disclosed |
There are currently no legacy QID mappings associated with this CVE.