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High

Appointment Booking Calendar <= 1.6.9.27 - Unauthenticated SQL Injection via 'append_where_sql' Parameter

  • Disclosed: 10.03.2026
  • Updated: 11.10.2026 10:22

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to blind SQL Injection in all versions up to, and including, 1.6.9.27. This is due to the db_where_conditions method in the TD_DB_Model class failing to prevent the append_where_sql parameter from being passed through JSON request bodies, while only checking for its presence in the $_REQUEST superglobal. This makes it possible for unauthenticated attackers to append arbitrary SQL commands to queries and extract sensitive information from the database via the append_where_sql parameter in JSON payloads granted they have obtained a valid public_token that is inadvertently exposed during the booking flow.

Affected software

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PlatformPackageVulnerable versionsFixed in
WordPress plugin Simply Schedule Appointments <= 1.6.9.27 1.6.9.29

References

CVSS score 7.5/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE)
CWE-89
Platform
WordPress
Package
Simply Schedule Appointments
Disclosed
10.03.2026
Updated
11.10.2026 10:22

Sources and licenses

Wordfence Intelligence - 71642341-9fe0-44a9-88f3-70167dc6ca62 - Wordfence Intelligence

Copyright 1999-2026 The MITRE Corporation

Copyright 2012-2026 Defiant Inc.

This record contains material that is subject to copyright

Copyright 1999-2026 The MITRE Corporation

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https://www.cve.org/Legal/TermsOfUse
Copyright 2012-2026 Defiant Inc.

Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.

https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/
Wordfence Intelligence
Wordfence Intelligence - Defiant, Inc.
Copyright Defiant, Inc. All rights reserved except as granted below.
License grant, section 3.1 of the Wordfence Intelligence Terms and Conditions (January 26, 2026):

Subject to this Agreement, Company hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute the Service. Any copy you make for such purposes is authorized provided that you reproduce Company’s copyright designation, this license, and the license of any disclosed Company licensor in any such copy.

Full applicable Agreement: https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/

Vulnerability history: Simply Schedule Appointments

All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (48) in the archive
Total entries
48
First → latest
08.2022 10.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • High 17
  • Medium 31

Disclosures per year

Severity:
  1. 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
    High · 7.5 CVE-2026-92245 <= 1.6.12.32 1.6.12.33
  2. Simply Schedule Appointments <= 1.6.12.27 - Authenticated (Subscriber+) Local File Inclusion via 'ssa_locale' Parameter
    High · 7.5 CVE-2026-89294 <= 1.6.12.27 1.6.12.33
  3. Simply Schedule Appointments <= 1.6.12.10 - Unauthenticated Stored Cross-Site Scripting
    High · 7.2 CVE-2026-65513 <= 1.6.12.10 1.6.12.11
  4. Simply Schedule Appointments <= 1.6.12.10 - Unauthenticated SQL Injection
    High · 7.5 CVE-2026-65508 <= 1.6.12.10 1.6.12.11
  5. Simply Schedule Appointments <= 1.6.12.3 - Unauthenticated Stored Cross-Site Scripting
    High · 7.2 CVE-2026-13400 <= 1.6.12.3 1.6.12.4
  6. Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.12.2 - Unauthenticated Stored Cross-Site Scripting
    High · 7.2 CVE-2026-57317 <= 1.6.12.2 1.6.12.4
  7. Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.10.6 - Unauthenticated Stored Cross-Site Scripting
    High · 7.2 CVE-2026-39447 <= 1.6.10.6 1.6.11.0
  8. Appointment Booking Calendar <= 1.6.11.8 - Unauthenticated SQL Injection via 'append_where_sql' Parameter
    High · 7.5 CVE-2026-7797 <= 1.6.11.8 1.6.11.9
  9. Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.9.27 - Unauthenticated SQL Injection
    High · 7.5 CVE-2026-39493 <= 1.6.9.27 1.6.9.29
  10. Appointment Booking Calendar <= 1.6.10.0 - Unauthenticated SQL Injection via 'fields' Parameter
    High · 7.5 CVE-2026-3658 <= 1.6.10.0 1.6.10.2
  11. Appointment Booking Calendar <= 1.6.9.29 - Missing Authorization to Unauthenticated Sensitive Information Exposure via Settings REST API Endpoint
    High · 7.5 CVE-2026-3045 <= 1.6.9.29 1.6.10.0
  12. Appointment Booking Calendar <= 1.6.9.27 - Unauthenticated SQL Injection via 'append_where_sql' Parameter this entry
    High · 7.5 CVE-2026-1708 <= 1.6.9.27 1.6.9.29
  13. Simply Schedule Appointments <= 1.6.9.9 - Unauthenticated SQL Injection via `order` and `append_where_sql` Parameters
    High · 7.5 CVE-2025-12166 <= 1.6.9.9 1.6.9.13
  14. Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.8.5 - Unauthenticated Arbitrary Shortcode Execution
    High · 7.3 CVE-2025-1119 <= 1.6.8.5 1.6.8.7
  15. Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.7.42 - Authenticated (Admin+) Remote Code Execution
    High · 7.2 CVE-2024-7129 <= 1.6.7.42 1.6.7.43
  16. Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.7.7 - Authenticated (Subscriber+) SQL Injection
    High · 8.8 CVE-2024-2341 <= 1.6.7.7 1.6.7.9
  17. Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.7.7 - Authenticated (Contributor+) SQL Injection via Shortcode
    High · 8.8 CVE-2024-2342 <= 1.6.7.7 1.6.7.9

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