Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin, CVE-2026-1708

CVE, Research URL: CVE-2026-1708
Home page URL: Security reports for Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin
Application: Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin
Published on: Mar 11, 2026
Research Description: 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 versions: max 1.6.9.29.
Status: vulnerable