Appointment Hour Booking <= 1.3.72 - CAPTCHA Bypass

5.3
Guessable CAPTCHA
CVE CVE-2022-4036
CVSS 5.3 (Medium)
Publicly Published November 29, 2022
Last Updated January 22, 2024
Researchers Luca Greeb
Andreas Krüger

Description

The Appointment Hour Booking plugin for WordPress is vulnerable to CAPTCHA bypass in versions up to, and including, 1.3.72. This is due to the use of insufficiently strong hashing algorithm on the CAPTCHA secret that is also displayed to the user via a cookie.

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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 1.3.73, or a newer patched version
Affected Version
  • <= 1.3.72
Patched Version
  • 1.3.73

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 – Booking Calendar <= 1.5.94 - Missing Authorization CVE-2026-66679 5.3 Tiago Ventura August 18, 2026
4 Appointment Hour Booking <= 1.5.87 - Unauthenticated Price Manipulation CVE-2026-16282 5.3 Alessandro Greco, Giovambattista Ianni August 3, 2026
5 Appointment Hour Booking – Booking Calendar <= 1.5.86 - Authenticated (Contributor+) Stored Cross-Site Scripting CVE-2026-65514 6.4 Ananda Dhakal July 23, 2026
6 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
7 Appointment Hour Booking <= 1.4.56 - Captcha Bypass CVE-2024-32720 5.3 Mochamad Sofyan April 22, 2024
8 Appointment Hour Booking <= 1.4.23 - Missing Authorization to Double Booking CVE-2023-45649 5.3 konagash October 11, 2023
9 Appointment Hour Booking <= 1.3.72 - Unauthenticated iFrame Injection via Appointment Form CVE-2022-4035 7.2 Luca Greeb, Andreas Krüger November 29, 2022
10 Appointment Hour Booking <= 1.3.72 - CSV Injection CVE-2022-4034 5.8 Luca Greeb, Andreas Krüger November 29, 2022

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