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CVE-2026-100163— Appointment Booking Plugin <= 5.7.2 - Unauthenticated Authentication Bypass to Customer Account Takeover via Insufficient Verification in create_wp_user_for_customer() username_exists Fallback

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 插件 Appointment Booking Plugin – LatePoint 这使得拥有 Subscriber 及以上权限的已认证攻击者，能够接管另一个客户的 LatePoint 账户。攻击者只需注册一个用户名（user_login）等于受害者电子邮件地址的 Subscriber 账户，并发起一次未经认证的公开预约步骤注册请求，即可实现账户劫持。成功劫持后，攻击者可以访问受害者的预约、服务、代理及日历数据；并且在受害者下次登录时，其电子邮件地址将被攻击者的电子邮件地址覆盖。

CVSS 7.4 · High EPSS 0.44% · P37

Affected Version Matrix 1

VendorProduct Version RangeStatus
latepoint Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress ≤ 5.7.2 affected
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I. Basic Information for CVE-2026-100163

Vulnerability Information
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Vulnerability Title
Appointment Booking Plugin <= 5.7.2 - Unauthenticated Authentication Bypass to Customer Account Takeover via Insufficient Verification in create_wp_user_for_customer() username_exists Fallback
Source: CVE Program / CVE List V5
Vulnerability Description
The Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress plugin for WordPress is vulnerable to Authentication Bypass in versions up to, and including, 5.7.2 via the OsCustomerHelper::create_wp_user_for_customer() helper reached from the public process_step_customer() booking step. When the 'Use WordPress users as customers' option is enabled, the helper falls back from email_exists() to username_exists( $customer->email ), which matches any WordPress user whose user_login equals the victim customer's email even when that user's user_email is completely different, and links that WordPress user's ID into the victim's LatePoint customer row (only privileged roles are excluded; Subscriber is allowed). This makes it possible for authenticated attackers, with Subscriber-level access and above, to take over another customer's LatePoint account — accessing their bookings, service, agent, and calendar data, and having the victim customer's email overwritten with the attacker's on next login — by holding a Subscriber account whose user_login equals the victim's email and submitting an unauthenticated public booking step registration request.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
latepoint Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress 0 ~ 5.7.2 -

II. Public POCs for CVE-2026-100163

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III. Intelligence Information for CVE-2026-100163

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Other References for CVE-2026-100163 (4)

Same Patch Batch · latepoint · 2026-10-14 · 3 CVEs total

CVE-2026-103366 7.5 HIGH Appointment Booking Plugin <= 5.7.3 - Insecure Direct Object Reference to Unauthenticated
CVE-2026-103380 4.3 MEDIUM Appointment Booking Plugin <= 5.7.3 - Authenticated (Subscriber+) Sensitive Information Ex

IV. Related Vulnerabilities

Same product: Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress
Same vendor: latepoint
Same weakness: CWE-287

V. Comments for CVE-2026-100163

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