croixhaug Appointment Booking Calendar Plugin up to 1.6.9.27 on WordPress JSON Request db_where_conditions sql injection

Summaryinfo

A vulnerability was found in croixhaug Appointment Booking Calendar Plugin up to 1.6.9.27 on WordPress. It has been rated as critical. The impacted element is the function db_where_conditions of the component JSON Request Handler. The manipulation leads to sql injection. This vulnerability is uniquely identified as CVE-2026-1708. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in croixhaug Appointment Booking Calendar Plugin up to 1.6.9.27 on WordPress and classified as critical. This issue affects the function db_where_conditions of the component JSON Request Handler. The manipulation with an unknown input leads to a sql injection vulnerability. Using CWE to declare the problem leads to CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was disclosed by Thanh Hao. The advisory is shared at wordfence.com. The identification of this vulnerability is CVE-2026-1708 since 01/30/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1505 for this issue.

Upgrading to version 1.6.9.21 eliminates this vulnerability.

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Productinfo

Type

• Appointment Software

Vendor

• croixhaug

Name

• Appointment Booking Calendar Plugin

Version

• 1.6.9.0
• 1.6.9.1
• 1.6.9.2
• 1.6.9.3
• 1.6.9.4
• 1.6.9.5
• 1.6.9.6
• 1.6.9.7
• 1.6.9.8
• 1.6.9.9
• 1.6.9.10
• 1.6.9.11
• 1.6.9.12
• 1.6.9.13
• 1.6.9.14
• 1.6.9.15
• 1.6.9.16
• 1.6.9.17
• 1.6.9.18
• 1.6.9.19
• 1.6.9.20
• 1.6.9.21
• 1.6.9.22
• 1.6.9.23
• 1.6.9.24
• 1.6.9.25
• 1.6.9.26
• 1.6.9.27

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CPE 2.2info

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