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CVE-2026-17538— Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress <= 5.6.9 - Authenticated (Subscriber+) Insecure Direct Object Reference to Arbitrary Customer PII Modification

Quick assessment

Affected
latepoint Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress
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 预约预订与保留插件 LatePoint 在 5.6.9 及之前版本中存在不安全直接对象引用（IDOR）漏洞。该漏洞源于 函数在将 POST 请求中的客户数据合并到现有 LatePoint 客户记录时，仅以 （用户是否已登录）作为唯一访问控制机制，而未实施任何所有权验证。因此，具有订阅者（Subscriber）级别或更高权限的已认证攻击者可以修改任意 LatePoint 客户个人信息（包括名、姓、电子邮件地址、电话号码和备注）。此外，当 配置设置为 "phone" 时，攻击者还能够覆盖受害者的电子

CVSS 5.4 · Medium
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I. Basic Information for CVE-2026-17538

Vulnerability Information
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Vulnerability Title
Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress <= 5.6.9 - Authenticated (Subscriber+) Insecure Direct Object Reference to Arbitrary Customer PII Modification
Source: CVE Program / CVE List V5
Vulnerability Description
The LatePoint - Appointment Booking & Reservation plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to, and including, 5.6.9. This is due to the process_step_customer() function using is_user_logged_in() as the sole gate before merging POSTed customer data into an existing LatePoint customer, without any ownership checks. This makes it possible for authenticated attackers, with Subscriber-level access and above, to modify the personal information (first name, last name, email, phone, notes) of arbitrary LatePoint customers, and, when the contact_merge setting is 'phone', to overwrite the victim's email address and take over the account via a password reset.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/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
latepoint Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress 0 ~ 5.6.9 -

II. Public POCs for CVE-2026-17538

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III. Intelligence Information for CVE-2026-17538

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Other References for CVE-2026-17538 (2)

IV. Related Vulnerabilities

Same product: Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress
Same vendor: latepoint
Same weakness: CWE-639

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