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CVE-2026-89063— Online Scheduling and Appointment Booking System <= 28.1 - Insecure Direct Object Reference to Unauthenticated Sensitive Data Access and Message Injection via 'conversation_id' Parameter

Quick assessment

Affected
ladela Online Scheduling and Appointment Booking System – Bookly
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 插件“在线排程与预约系统 – Bookly”（版本 28.1 及更早的所有版本）存在不安全的直接对象引用（IDOR）漏洞。该漏洞由对由用户控制的“conversation_id”参数缺乏有效验证所致。 这一漏洞使得未经身份验证的攻击者能够： 1. 读取任意客户的完整 AI 预约对话记录，从而泄露客户的姓名、电子邮件地址、电话号码以及由 AI 助手回显的预约详情； 2. 向任意受害者的对话中注入任意消息，这些注入的消息随后将与完整的私有历史一并重放至云端 AI 工作进程（Cloud AI work

CVSS 7.5 · High
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I. Basic Information for CVE-2026-89063

Vulnerability Information
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Vulnerability Title
Online Scheduling and Appointment Booking System <= 28.1 - Insecure Direct Object Reference to Unauthenticated Sensitive Data Access and Message Injection via 'conversation_id' Parameter
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ladela Online Scheduling and Appointment Booking System – Bookly 0 ~ 28.1 -

II. Public POCs for CVE-2026-89063

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III. Intelligence Information for CVE-2026-89063

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Patches & Fixes for CVE-2026-89063 (1)

Vendor Advisories for CVE-2026-89063 (1)

Vendor Pages for CVE-2026-89063 (1)

Other References for CVE-2026-89063 (3)

IV. Related Vulnerabilities

Same product: Online Scheduling and Appointment Booking System – Bookly
Same vendor: ladela
Same weakness: CWE-639

V. Comments for CVE-2026-89063

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