CheckView WordPress Plugin REST API Authentication Bypass

Executive Summary

This vulnerability affects the CheckView WordPress plugin versions before 2.3.2. It allows unauthenticated attackers to bypass REST API authentication by exploiting a flaw where the plugin does not restrict its authentication filter to its own routes. The plugin ignores authentication errors for requests containing a plugin-specific string, enabling attackers to bypass the REST nonce check and perform unauthorized actions.

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Detection Guidance

Check if the CheckView WordPress plugin version is below 2.3.2 by inspecting the plugin files or WordPress admin panel. Look for plugin-specific strings in REST API requests that may indicate exploitation attempts.

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Impact Analysis

An attacker could trick an administrator into opening a malicious link, allowing them to bypass authentication and perform actions like creating a new administrator account. This could lead to full control of the WordPress site.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data or administrative functions, which may violate compliance requirements under GDPR (e.g., unauthorized data access or processing) and HIPAA (e.g., unauthorized changes to patient records or system configurations).

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Mitigation Strategies

Update the CheckView WordPress plugin to version 2.3.2 or later immediately. Disable the plugin temporarily if an update is not immediately available. Monitor for unauthorized administrator account creation.

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