Unauthenticated Stored XSS in WP Real IP-based Access Control WordPress Plugin

Executive Summary

This is an unauthenticated stored Cross-Site Scripting (XSS) vulnerability in the WP Real IP-based Access Control WordPress plugin versions 1.3.1 and below. It allows attackers to inject malicious JavaScript into the plugin's settings page by exploiting missing capability and nonce checks when storing user input in the acl_ctrl_addr option. The stored payload executes when an administrator views the page because the output is not escaped.

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Detection Guidance

Check for unauthorized modifications to the plugin's settings page or database entries. Inspect network traffic for POST requests to admin-ajax.php with the ac l_ctrl_addr parameter containing suspicious payloads. Review server logs for unusual activity targeting the plugin.

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Impact Analysis

An unauthenticated attacker could inject JavaScript that executes in the context of any administrator viewing the plugin's settings page. This could lead to session hijacking, account takeover, or further compromise of the WordPress site. Attackers might steal sensitive data or perform unauthorized actions on behalf of administrators.

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Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR's data protection requirements and HIPAA's security rules. If exploited, it may result in unauthorized disclosure of personal or health data, triggering compliance violations and potential legal penalties.

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Mitigation Strategies

Disable the WP Real IP-based Access Control plugin immediately. Remove any unauthorized JavaScript from the plugin's settings page. Monitor for signs of compromise. Consider implementing a web application firewall to block malicious requests.

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