Stored XSS in CMP WordPress Plugin

Executive Summary

This is a stored Cross-Site Scripting (XSS) vulnerability in the CMP WordPress plugin before version 4.1.18. It occurs because the plugin does not properly sanitize and escape a settings value before displaying it on the coming-soon page. Users with the Editor role can inject malicious scripts if granted access to the plugin's admin-bar controls. These scripts execute when visitors view the affected page.

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Detection Guidance

Check the installed version of the CMP WordPress plugin. If it is below 4.1.18, the system is vulnerable. Use WordPress admin dashboard or run: wp plugin list | grep cmp. Alternatively, inspect the plugin files for the niteoCS_socialmedia setting in the coming-soon page output.

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Impact Analysis

If exploited, this vulnerability allows attackers to inject malicious scripts into your WordPress site. Visitors viewing the coming-soon page may have their browsers compromised, leading to theft of cookies, session tokens, or other sensitive data. It could also enable phishing attacks or defacement of your site.

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Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR's data protection requirements. For HIPAA, it may compromise protected health information if exploited. Both standards require safeguarding user data, and this flaw could result in non-compliance, legal penalties, or reputational damage.

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Mitigation Strategies

Update the CMP WordPress plugin to version 4.1.18 or later immediately. Remove Editor role access to the plugin's admin-bar controls if not required. Review and sanitize all user-input settings in the plugin configuration.

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