Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.7.7 - Authenticated (Contributor+) SQL Injection via Shortcode

8.8
Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
CVE CVE-2024-2342
CVSS 8.8 (High)
Publicly Published March 20, 2024
Last Updated April 9, 2024
Researcher Krzysztof Zając - CERT PL

Description

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to SQL Injection via the customer_id parameter in all versions up to, and including, 1.6.7.7 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for authenticated attackers, with contributor access or higher, to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.

Learn more about SQL Injection vulnerabilities and how to prevent them.

References

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Vulnerability Details for Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin

Software Type Plugin
Software Slug simply-schedule-appointments (view on wordpress.org)
Patched? Yes
Remediation Update to version 1.6.7.9, or a newer patched version
Affected Version
  • <= 1.6.7.7
Patched Version
  • 1.6.7.9

Recent vulnerabilities in Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin

# Title CVE ID CVSS Researchers Date
1 Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.11.11 - Missing Authorization CVE-2026-59523 5.3 anhcd05 July 9, 2026
2 Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.12.4 - Missing Authorization CVE-2026-57812 5.3 hio July 9, 2026
3 Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.12.2 - Unauthenticated Stored Cross-Site Scripting CVE-2026-57317 7.2 vnth4nhnt June 26, 2026
4 Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.10.6 - Unauthenticated Stored Cross-Site Scripting CVE-2026-39447 7.2 devploit May 28, 2026
5 Appointment Booking Calendar <= 1.6.11.8 - Missing Authorization to Unauthenticated Arbitrary Modification via Bulk Appointments REST API Endpoint CVE-2026-6937 5.3 winrace May 27, 2026
6 Appointment Booking Calendar <= 1.6.11.8 - Unauthenticated SQL Injection via 'append_where_sql' Parameter CVE-2026-7797 7.5 daroo May 27, 2026
7 Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.11.5 - Unauthenticated Denial of Service CVE-2026-7493 5.3 lucky_buddy May 26, 2026
8 Appointment Booking Calendar <= 1.6.10.6 - Unauthenticated Arbitrary Appointment View, Modification and Deletion CVE-2026-4807 6.5 Athiwat Tiprasaharn (Jitlada) May 6, 2026
9 Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin < 1.6.11.2 - Unauthenticated Sensitive Information Exposure CVE-2026-42384 5.3 Jakub Herman April 27, 2026
10 Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.9.27 - Unauthenticated SQL Injection CVE-2026-39493 7.5 Doan Dinh Van (d52v) April 8, 2026

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