Stored XSS exists in the Appointment Booking Calendar plugin before 1.3.35 for WordPress. In the cpabc_appointments.php file, the Calendar Name input could allow attackers to inject arbitrary JavaScript or HTML.

The Appointment Booking Calendar Plugin and Scheduling Plugin WordPress plugin before 1.1.23 export settings functionality exports data to a public folder, with an easily guessable file name, allowing unauthenticated attackers to access the exported files (if they exist).

The Booking Calendar and Booking Calendar Pro plugins for WordPress are vulnerable to Reflected Cross-Site Scripting via the ‘calendar_id’ parameter in all versions up to, and including, 3.2.19 and 11.2.19 respectively, due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

The Appointment Booking Calendar Plugin and Scheduling Plugin – BookingPress plugin for WordPress is vulnerable to SQL Injection via the 'category' parameter of the 'bookingpress_form' shortcode in all versions up to, and including, 1.1.21 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for authenticated attackers, with Contributor-level access and above, to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.

The Booking Calendar WpDevArt plugin is vulnerable to time-based, blind SQL injection via the `id` parameter in the “wpdevart_booking_calendar” shortcode in versions up to, and including, 3.2.19 due to insufficient escaping on the user-supplied parameter and lack of sufficient preparation on the existing SQL query. The vulnerability requires the “delete_prev_date” theme option being enabled. This makes it possible for authenticated attackers, with contributor-level access or above, to append additional SQL queries into already existing query that can be used to extract sensitive information such as passwords from the database.

The WP Timetics- AI-powered Appointment Booking Calendar and Online Scheduling Plugin plugin for WordPress is vulnerable to unauthorized loss of data due to a missing capability check on the /wp-json/timetics/v1/customers/ REST API endpoint in all versions up to, and including, 1.0.27. This makes it possible for authenticated attackers, with Timetics Customer access and above, to delete arbitrary users.

Missing Authorization vulnerability in WpDevArt Booking calendar, Appointment Booking System allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Booking calendar, Appointment Booking System: from n/a through 3.2.3.

The Booking calendar, Appointment Booking System plugin for WordPress is vulnerable to Stored Cross-Site Scripting via SVG File uploads in all versions up to, and including, 3.2.15 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses the SVG file.

The WP Timetics- AI-powered Appointment Booking Calendar and Online Scheduling Plugin plugin for WordPress is vulnerable to Account Takeover/Privilege Escalation via Insecure Direct Object Reference in all versions up to, and including, 1.0.25 via the save() due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to reset the emails and passwords of arbitrary user accounts, including administrators, which makes account takeover and privilege escalation possible.

The Freemius SDK, as used by hundreds of WordPress plugin and theme developers, was vulnerable to Cross-Site Request Forgery and Information disclosure due to missing capability checks and nonce protection on the _get_debug_log, _get_db_option, and the _set_db_option functions in versions up to, and including 2.4.2. Any WordPress plugin or theme running a version of Freemius less than 2.4.3 is vulnerable.