Simply Schedule Appointments <= 1.6.8.30 - Authenticated (Contributor+) Stored Cross-Site Scripting via Multiple Shortcodes

6.4
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2025-4667
CVSS 6.4 (Medium)
Publicly Published June 13, 2025
Last Updated June 14, 2025
Researcher Muhammad Yudha - DJ

Description

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's ssa_admin_upcoming_appointments, ssa_admin_upcoming_appointments, and ssa_past_appointments shortcodes in all versions up to, and including, 1.6.8.30 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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

References

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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 1.6.8.32, or a newer patched version
Affected Version
  • <= 1.6.8.30
Patched Version
  • 1.6.8.32

Recent vulnerabilities in Simply Schedule Appointments

# Title CVE ID CVSS Researchers Date
1 Simply Schedule Appointments <= 1.6.12.10 - Unauthenticated SQL Injection CVE-2026-65508 7.5 daroo July 28, 2026
2 Simply Schedule Appointments <= 1.6.12.10 - Unauthenticated Stored Cross-Site Scripting CVE-2026-65513 7.2 whitebyte July 28, 2026
3 Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.11.11 - Missing Authorization CVE-2026-59523 5.3 anhcd05 July 9, 2026
4 Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.12.4 - Missing Authorization CVE-2026-57812 5.3 hio July 9, 2026
5 Simply Schedule Appointments <= 1.6.12.3 - Unauthenticated Stored Cross-Site Scripting CVE-2026-13400 7.2 Revanth Hari Narayana Matte July 6, 2026
6 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
7 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
8 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
9 Appointment Booking Calendar <= 1.6.11.8 - Unauthenticated SQL Injection via 'append_where_sql' Parameter CVE-2026-7797 7.5 daroo May 27, 2026
10 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

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