Appointment Hour Booking – Booking Calendar <= 1.5.94 - Missing Authorization

5.3
Missing Authorization
CVE CVE-2026-66679
CVSS 5.3 (Medium)
Publicly Published August 18, 2026
Last Updated September 16, 2026
Researcher Tiago Ventura

Description

The Appointment Hour Booking – Booking Calendar plugin for WordPress is vulnerable to unauthorized access in all versions up to, and including, 1.5.94. This is due to a missing capability check on a function. This makes it possible for unauthenticated attackers to perform an unauthorized action.

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Vulnerability Details for Appointment Hour Booking – Booking Calendar

Software Type Plugin
Software Slug appointment-hour-booking (view on wordpress.org)
Patched? Yes
Remediation Update to version 1.5.95, or a newer patched version
Affected Version
  • <= 1.5.94
Patched Version
  • 1.5.95

Recent vulnerabilities in Appointment Hour Booking – Booking Calendar

# Title CVE ID CVSS Researchers Date
1 Appointment Hour Booking <= 1.5.97 - Unauthenticated Stored DOM-Based Cross-Site Scripting via Booking Form Single-Line Field via Schedule Calendar List Renderer CVE-2026-96573 7.2 Hayoso September 30, 2026
2 Appointment Hour Booking <= 1.5.94 - Unauthenticated Appointment Slot Capacity Bypass CVE-2026-86475 5.3 Nicat Sultanov September 14, 2026
3 Appointment Hour Booking <= 1.5.87 - Unauthenticated Price Manipulation CVE-2026-16282 5.3 Alessandro Greco, Giovambattista Ianni August 3, 2026
4 Appointment Hour Booking – Booking Calendar <= 1.5.86 - Authenticated (Contributor+) Stored Cross-Site Scripting CVE-2026-65514 6.4 Ananda Dhakal July 23, 2026
5 Appointment Hour Booking – Booking Calendar <= 1.5.60 - Authenticated (Administrator+) Stored Cross-Site Scripting via 'Min/Max Length' Field Configuration CVE-2026-1083 4.4 ALockWooD January 27, 2026
6 Appointment Hour Booking <= 1.4.56 - Captcha Bypass CVE-2024-32720 5.3 Mochamad Sofyan April 22, 2024
7 Appointment Hour Booking <= 1.4.23 - Missing Authorization to Double Booking CVE-2023-45649 5.3 konagash October 11, 2023
8 Appointment Hour Booking <= 1.3.72 - Unauthenticated iFrame Injection via Appointment Form CVE-2022-4035 7.2 Luca Greeb, Andreas Krüger November 29, 2022
9 Appointment Hour Booking <= 1.3.72 - CSV Injection CVE-2022-4034 5.8 Luca Greeb, Andreas Krüger November 29, 2022
10 Appointment Hour Booking <= 1.3.72 - CAPTCHA Bypass CVE-2022-4036 5.3 Luca Greeb, Andreas Krüger November 29, 2022

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