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.
CVE-2026-1708 is a high severity with CVSS 7.5 SQL Injection issue affecting the Plugin Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin. It affects Versions up to 1.6.9.27 and is fixed in 1.6.9.29.
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CVE-2026-1708 is tracked for the Plugin Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin as high severity with CVSS 7.5. The affected range is Versions up to 1.6.9.27. Update Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin to 1.6.9.29 or newer where that version is compatible with the site.
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Affected version data gives operators a concrete comparison point against installed WordPress software.
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External references are available for source validation, advisory review, and incident notes.
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Inventory the installed Plugin package and compare its version with Versions up to 1.6.9.27.
Confirm Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin is updated to 1.6.9.29 or newer.
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After patching, re-run vulnerability monitoring and keep the related plugin or theme hub under review for follow-up CVEs.
| Software Type | Plugin |
|---|---|
| Software Slug |
simply-schedule-appointments
View on wordpress.org
|
| CVE | CVE-2026-1708 |
| Patched Versions |
1.6.9.29
|
| Affected Versions |
Versions up to 1.6.9.27
|
These internal links group the same WordPress plugin by CVE, issue type, severity, and patch status so operators and search engines can connect the full vulnerability cluster.
Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.7.7 - Authenticated (Subscriber+) SQL Injection
Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.7.7 - Authenticated (Contributor+) SQL Injection via Shortcode
Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.9.27 - Unauthenticated SQL Injection
Appointment Booking Calendar <= 1.6.10.0 - Unauthenticated SQL Injection via 'fields' Parameter
Appointment Booking Calendar <= 1.6.9.29 - Missing Authorization to Unauthenticated Sensitive Information Exposure via Settings REST API Endpoint
Simply Schedule Appointments <= 1.6.9.9 - Unauthenticated SQL Injection via `order` and `append_where_sql` Parameters
Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.8.5 - Unauthenticated Arbitrary Shortcode Execution
Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.7.42 - Authenticated (Admin+) Remote Code Execution
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