Sensitive Information Exposure in Simply Schedule Appointments Plugin

Executive Summary

This vulnerability in the Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin for WordPress allows unauthenticated attackers to access the plugin's admin embed endpoint at `/wp-json/ssa/v1/embed-inner-admin` without any authentication. This endpoint exposes sensitive plugin settings such as staff names, business names, and configuration data that are not publicly visible on the booking form. In premium versions with integrations, it may also leak API keys for external services, leading to sensitive information exposure. [1]

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Impact Analysis

The impact of this vulnerability is that attackers can extract private business configuration and sensitive data without authentication. This could lead to unauthorized disclosure of staff and business information, and in premium versions, exposure of API keys for external services. Such information leakage can be exploited for further attacks, social engineering, or unauthorized access to integrated services. [1]

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Detection Guidance

You can detect this vulnerability by checking if the REST API endpoint `/wp-json/ssa/v1/embed-inner-admin` is accessible without authentication. For example, you can use the following curl command to test access: curl -i -X GET https://your-wordpress-site.com/wp-json/ssa/v1/embed-inner-admin If the response returns plugin settings or sensitive data without requiring authentication, your system is vulnerable. [1]

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Mitigation Strategies

Immediately update the Simply Schedule Appointments Booking Plugin to version 1.6.9.17 or later, which restricts access to the vulnerable REST API endpoint by requiring appropriate user permissions. This update changes the permission callback to ensure only authorized users can access sensitive data, effectively mitigating the vulnerability. [1]

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Compliance Impact

The vulnerability exposes sensitive business configuration data and potentially API keys without authentication, which could lead to unauthorized access to private information. This exposure may result in non-compliance with data protection regulations such as GDPR or HIPAA, which require safeguarding sensitive information and preventing unauthorized access. However, specific impacts on compliance are not detailed in the provided resources. [1]

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