---
id: CVE-2026-110653
title: >-
  Appointment Booking Plugin <= 5.7.4 - Unauthenticated Authentication Bypass
  via Race Condition on OTP Attempts Counter
summary: >-
  The Appointment Booking Plugin – LatePoint | Calendar & Scheduling for
  WordPress plugin for WordPress is vulnerable to Authentication Bypass via Race
  Condition in all versions up to, and including, 5.7.4. This is due to a
  non-atomic read…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-287
vendor: latepoint
product: Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress
affected:
  - >-
    appointment_booking_plugin_latepoint_calendar_scheduling_for_wordpress <=
    5.7.4
published: '2026-10-17'
updated: '2026-10-17'
sourceUpdated: '2026-10-17T02:31:06.697Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-110653'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/61fbc1dd-06c9-409b-8cad-3f350b38dfc3?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/latepoint/tags/5.7.4/lib/helpers/otp_helper.php#L228
  - url: >-
      https://plugins.trac.wordpress.org/browser/latepoint/tags/5.7.4/lib/helpers/otp_helper.php#L185
  - url: >-
      https://plugins.trac.wordpress.org/browser/latepoint/tags/5.7.4/lib/controllers/auth_controller.php#L30
  - url: >-
      https://plugins.trac.wordpress.org/browser/latepoint/tags/5.7.4/lib/controllers/auth_controller.php#L14
  - url: >-
      https://plugins.trac.wordpress.org/browser/latepoint/tags/5.7.4/lib/models/model.php#L773
  - url: >-
      https://plugins.trac.wordpress.org/browser/latepoint/tags/5.7.5/lib/helpers/otp_helper.php
tags:
  - cve.org
ingestedAt: '2026-10-17T02:57:58.443Z'
---

## Overview

The Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress plugin for WordPress is vulnerable to Authentication Bypass via Race Condition in all versions up to, and including, 5.7.4. This is due to a non-atomic read-modify-write on the OTP verification attempts counter in the `verifyOTP` function: the counter is incremented using a stale in-memory value with no conditional `WHERE attempts < 10` guard on the `UPDATE` and no `SELECT ... FOR UPDATE` row lock, creating a TOCTOU window that allows concurrent requests to bypass the 10-attempt lockout. This makes it possible for unauthenticated attackers — who know a target customer's registered email address or phone number — to fire concurrent requests to the `auth__verify_otp` endpoint, defeat the lockout cap, brute-force the 6-digit OTP code, and authenticate as the targeted LatePoint customer, gaining full access to their account, bookings, and personal data. The nonce check present on the endpoint (`otp_verify_otp_nonce`) does not mitigate this issue, as the nonce is publicly emitted by the unauthenticated `request_otp` and `resend_otp` endpoints and is trivially obtainable by any unauthenticated attacker prior to launching the race.

## Affected

- `appointment_booking_plugin_latepoint_calendar_scheduling_for_wordpress <= 5.7.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.