Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.8.3 - Reflected Cross-Site Scripting

6.1
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2024-13431
CVSS 6.1 (Medium)
Publicly Published March 6, 2025
Last Updated April 4, 2025
Researcher Luciano Hanna

Description

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the accent_color and background parameter in all versions up to, and including, 1.6.8.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.

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Vulnerability Details for Simply Schedule Appointments

Software Type Plugin
Software Slug simply-schedule-appointments (view on wordpress.org)
Patched? Yes
Remediation Update to version 1.6.8.5, or a newer patched version
Affected Version
  • <= 1.6.8.3
Patched Version
  • 1.6.8.5

Recent vulnerabilities in Simply Schedule Appointments

# Title CVE ID CVSS Researchers Date
1 Simply Schedule Appointments <= 1.6.12.31 - Insecure Direct Object Reference to Authenticated (Subscriber+) Sensitive Information Disclosure via 'complete_group' Parameter CVE-2026-91109 6.5 jtb75 September 30, 2026
2 Simply Schedule Appointments <= 1.6.12.32 - Missing Authorization to Unauthenticated Sensitive Information Exposure and Arbitrary Appointment Deletion via 'recursive' Parameter on the appointment_types REST Endpoint via Public Nonce CVE-2026-92245 7.5 Md. Moniruzzaman Prodhan (NomanProdhan) September 30, 2026
3 Simply Schedule Appointments <= 1.6.12.27 - Authenticated (Subscriber+) Local File Inclusion via 'ssa_locale' Parameter CVE-2026-89294 7.5 crow September 29, 2026
4 Simply Schedule Appointments <= 1.6.12.31 - Unauthenticated Insecure Direct Object Reference CVE-2026-94673 5.3 rpgsec September 24, 2026
5 Simply Schedule Appointments <= 1.6.12.29 - Missing Authorization CVE-2026-94074 5.3 Mor Golan September 24, 2026
6 Simply Schedule Appointments <= 1.6.12.23 - Cross-Site Request Forgery CVE-2026-84764 4.3 Anthony Green of Greenhat Security September 2, 2026
7 Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.12.10 - Authenticated (Contributor+) Insecure Direct Object Reference to Sensitive Information Exposure CVE-2026-13358 6.5 Michael Iden (Mickhat) August 15, 2026
8 Simply Schedule Appointments <= 1.6.12.16 - Authenticated (Team Member+) Information Exposure CVE-2026-16541 4.3 Yaswanth Reddy Sunkara August 13, 2026
9 Simply Schedule Appointments < 1.6.12.6 - Unauthenticated Insecure Direct Object Reference CVE-2026-16540 5.3 Suleyman Huseynov August 6, 2026
10 Simply Schedule Appointments <= 1.6.12.10 - Unauthenticated Stored Cross-Site Scripting CVE-2026-65513 7.2 whitebyte July 28, 2026

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