Easy Appointments WordPress Plugin Authentication Bypass

Executive Summary

The Easy Appointments WordPress plugin up to version 3.12.26 lacks proper authorization checks in appointment-management actions. It relies only on a nonce for security, which any authenticated user can obtain. This allows users with Contributor-level access to read all customers' appointment details, including sensitive PII, and to create, modify, or delete bookings.

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Detection Guidance

Check if the Easy Appointments plugin version is 3.12.26 or lower. Inspect WordPress user roles with Contributor access for unusual appointment modifications or deletions. Review server logs for unauthorized API calls to appointment endpoints.

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Impact Analysis

An attacker with Contributor access could steal sensitive customer data like names, emails, phone numbers, prices, and appointment dates. They could also manipulate or delete bookings, disrupting services and potentially causing financial or reputational harm.

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Compliance Impact

This vulnerability could lead to unauthorized access and exposure of personally identifiable information (PII), violating GDPR and HIPAA requirements for data protection and access control. Organizations may face legal penalties and compliance failures.

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Mitigation Strategies

Update the Easy Appointments plugin to the latest version. Restrict Contributor role permissions to prevent access to appointment management actions. Monitor for unauthorized changes to appointments and sensitive data.

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