CVE-2026-111602 in Appointment Booking Plugin
Summary
by MITRE • 10/17/2026
The Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 5.7.4 via the 'params (customer[uuid])' parameter. This makes it possible for unauthenticated attackers to extract the first name, last name, email address, phone number, and notes of every customer record in the database by enumerating uuid prefixes via the unauthenticated steps__load_step AJAX endpoint. This vulnerability is only exploitable when the LatePoint plugin is configured with the 'Field used for authentication' setting set to 'Disable ability to login' (guest checkout mode).
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Analysis
by VulDB Data Team • 10/17/2026
The Appointment Booking Plugin, known as LatePoint or Calendar & Scheduling for WordPress, contains a critical security flaw that allows unauthenticated attackers to access sensitive customer data. This vulnerability exists in all versions up to and including 5.7.4 and is specifically triggered through the params parameter associated with customer[uuid]. The core issue lies within an AJAX endpoint named steps__load_step, which fails to properly validate or restrict access based on user authentication status when specific configuration settings are active. By exploiting this flaw, attackers can systematically enumerate UUID prefixes to retrieve detailed personal information belonging to every customer record stored in the WordPress database.
The technical mechanism of this vulnerability relies on the plugin's handling of guest checkout modes. When the LatePoint plugin is configured with the Field used for authentication setting set to Disable ability to login, it operates in a guest checkout mode where users are not required to log in or authenticate before booking appointments. In this state, the steps__load_step endpoint processes requests containing customer UUIDs without sufficient verification of whether the requester has legitimate access rights to that specific data. Because the system does not enforce strict ownership checks on these unauthenticated API calls, an attacker can iterate through potential UUID prefixes to construct valid requests for any existing customer record. This enumeration process allows the extraction of first name, last name, email address, phone number, and internal notes associated with each victim's profile.
From a classification perspective, this vulnerability aligns directly with CWE-200: Information Exposure, as it results in the unauthorized disclosure of sensitive data to an unauthenticated actor. Furthermore, the exploitation technique maps to ATT&CK T1595: Active Scanning, specifically the sub-technique of Vulnerability Scanning or Enumeration, where attackers probe systems for misconfigurations and weak access controls that can be leveraged to gather intelligence. The ability to extract personally identifiable information (PII) such as email addresses and phone numbers also raises significant concerns regarding compliance with data protection regulations like GDPR or CCPA, given the scale of exposure possible through simple enumeration attacks.
The operational impact of this vulnerability is severe for businesses relying on LatePoint for customer management. The mass exfiltration of contact details and personal notes can lead to targeted phishing campaigns, spamming, identity theft, and reputational damage. Since the attack requires no authentication, it poses a risk even to sites with strong administrative passwords or firewalls, as the entry point is an unauthenticated AJAX endpoint designed for frontend functionality. The presence of internal notes in the exposed data may also reveal business secrets or sensitive customer preferences that were never intended for public view.
Mitigation strategies must address both immediate remediation and long-term security posture improvements. Administrators should immediately update the LatePoint plugin to a version later than 5.7.4, where this access control flaw has been resolved by implementing proper authorization checks on the steps__load_step endpoint. If updating is not immediately feasible, administrators can mitigate the risk by disabling guest checkout mode and requiring user authentication for all bookings, thereby ensuring that only authenticated users with valid sessions can request customer data. Additionally, reviewing server-side logs to identify any signs of UUID enumeration activity can help assess the extent of potential exposure. Implementing rate limiting on AJAX endpoints may also slow down automated enumeration attempts, providing a layer of defense in depth while permanent patches are applied.