Authorization Bypass in Easy Appointments WordPress Plugin

Executive Summary

The Easy Appointments plugin for WordPress has an authorization bypass vulnerability in all versions up to and including 3.12.27. This occurs because the plugin does not properly verify if a user is authorized to perform certain actions.

Specifically, authenticated users with author-level access or higher can cancel all upcoming appointments site-wide by marking every future appointment as abandoned. This is possible because the nonce required to authenticate the cancellation request is exposed on the Appointments admin page, which is accessible to users with the edit_posts capability that authors have.

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Impact Analysis

This vulnerability allows low-privileged authenticated users (authors and above) to cancel all future appointments across the site without proper authorization.

The impact is limited to the integrity of appointment data, as attackers can disrupt scheduled appointments by marking them as abandoned. However, the vulnerability does not affect confidentiality or availability.

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Compliance Impact

The vulnerability allows authenticated users with author-level access to cancel all upcoming appointments site-wide by bypassing authorization checks. While this impacts the integrity of appointment data, there is no direct indication that it leads to unauthorized access to personal data or disclosure of sensitive information.

Because the vulnerability primarily affects the integrity and availability of appointment scheduling data rather than confidentiality, its impact on compliance with standards like GDPR or HIPAA is limited. However, disruption of appointment data could indirectly affect operational compliance or service availability requirements under such regulations.

No explicit information is provided about data exposure or privacy violations that would directly violate GDPR, HIPAA, or similar regulations.

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