What the vulnerability does
01Description
The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 1.6.9.16. This is due to the plugin exposing its admin embed endpoint at `/wp-json/ssa/v1/embed-inner-admin` without authentication, which leaks plugin settings including staff names, business names, and configuration data that are not publicly displayed on the booking form. This makes it possible for unauthenticated attackers to extract private business configuration. In premium versions with integrations configured, this might also expose other sensitive data including API keys for external services.
Explanation of Vulnerability in Simple Terms
02Summary
The Appointment Booking Calendar plugin for WordPress contains a missing authorization check that allows unauthenticated attackers to read sensitive information. An attacker can access the plugin without logging in or requiring user interaction. This exposes data that should be restricted to authorized users only. Update to a version newer than 1.6.9.16.
What an attacker can do
03Attacker Capabilities
Read sensitive appointment or booking data without authentication.
Potential impact on your site
04Site Impact
Appointment booking data, customer information, or scheduling details may be exposed to the public.
Conditions required to exploit
05Prerequisites
Network access to the WordPress site; no authentication or user interaction required.
Key dates
06Disclosure timeline
December 19, 2025
CVE published
April 8, 2026
Record updated
