Sensitive Information Exposure in Appointment Booking Calendar WordPress Plugin

Executive Summary

The Appointment Booking Calendar plugin for WordPress has a vulnerability in all versions up to and including 1.4.02. This vulnerability allows authenticated attackers with contributor-level access or higher to exploit the cpabc_appointments_filter_list feature to access sensitive customer information.

• Attackers can extract personally identifiable information such as customer names, email addresses, phone numbers, appointment comments, and other booking details.

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Detection Guidance

This vulnerability involves the Appointment Booking Calendar plugin for WordPress exposing sensitive customer information via the cpabc_appointments_filter_list to authenticated users with contributor-level access and above.

To detect this vulnerability on your system, you should first verify if the Appointment Booking Calendar plugin is installed and its version is up to and including 1.4.02.

Since the vulnerability requires authenticated access, monitoring logs for suspicious access patterns by contributor-level users or higher to endpoints related to cpabc_appointments_filter_list could help detect exploitation attempts.

Specific commands to detect the plugin version or suspicious activity might include:

• Using WP-CLI to check the plugin version: `wp plugin list --format=json | jq '.[] | select(.name=="appointment-booking-calendar")'`
• Searching web server logs for requests to cpabc_appointments_filter_list endpoints: `grep cpabc_appointments_filter_list /var/log/apache2/access.log` (or equivalent log path)
• Reviewing WordPress user roles and recent activity for contributor-level users to detect unusual access.

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Impact Analysis

This vulnerability can lead to unauthorized disclosure of sensitive customer data if an attacker has contributor-level access or above on the WordPress site.

• Exposure of personally identifiable information (PII) such as names, emails, phone numbers, and appointment comments.
• Potential privacy violations and loss of customer trust.
• Increased risk of targeted phishing or social engineering attacks using the exposed data.

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Compliance Impact

This vulnerability allows authenticated attackers with contributor-level access and above to extract personally identifiable information (PII) such as customer names, email addresses, phone numbers, and appointment comments from the Appointment Booking Calendar plugin for WordPress.

Exposure of such sensitive personal data can lead to non-compliance with data protection regulations like GDPR and HIPAA, which require the protection of personal and health-related information from unauthorized access.

Organizations using this plugin may face increased risk of data breaches and potential regulatory penalties if this vulnerability is exploited and the PII is accessed or disclosed improperly.

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Mitigation Strategies

The primary mitigation step is to update the Appointment Booking Calendar plugin to a version later than 1.4.02 where this vulnerability is fixed.

If an immediate update is not possible, restrict contributor-level and higher user access to trusted users only, as the vulnerability requires authenticated access at this level.

Additionally, monitor and audit access logs for any suspicious activity related to the cpabc_appointments_filter_list functionality.

Consider temporarily disabling or removing the plugin if the risk is high and no patch is available.

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