Authentication Bypass in miniOrange JWT Auth WordPress Plugin

Executive Summary

This vulnerability is an authentication method downgrade flaw in the miniOrange JWT Authentication for WP REST APIs plugin for WordPress before version 4.8.0. It allows unauthenticated attackers to bypass administrator-configured authentication by supplying a specific GET parameter without capability checks or nonce verification. Attackers can force the plugin to use Basic HTTP authentication instead of configured JWT or API token settings.

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Detection Guidance

Check if the plugin version is below 4.8.0 by inspecting the WordPress admin panel under Plugins. Look for error responses from REST API endpoints that reveal user enumeration or authentication failures. Monitor network traffic for Basic HTTP authentication attempts when JWT or API tokens are expected.

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Impact Analysis

Attackers can exploit this vulnerability to perform unthrottled username enumeration and credential guessing attacks. The flaw enables distinguishable error codes and the absence of rate limiting, making it easier for attackers to guess valid credentials and gain unauthorized access to the WordPress site.

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Compliance Impact

This vulnerability allows unauthenticated attackers to bypass authentication, enabling unauthorized access to WordPress REST APIs. This could lead to exposure of sensitive user data, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information if such data is processed by the plugin.

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Mitigation Strategies

Update the plugin to version 4.8.0 or later immediately. Disable Basic HTTP authentication if not required. Implement rate limiting on REST API endpoints. Review and restrict user roles with API access. Monitor logs for suspicious authentication attempts.

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