XSS via Unsanitized Shortcode Attribute in Joli Table Of Contents

Executive Summary

This is a stored cross-site scripting (XSS) vulnerability in the Joli Table Of Contents WordPress plugin before version 3.0.3. It occurs because the plugin does not properly sanitize or escape a shortcode attribute value before outputting it in an HTML attribute. This allows users with Author role or higher to inject malicious HTML attributes and JavaScript code that executes when other users view the post, including administrators.

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Detection Guidance

Check the installed version of the Joli Table Of Contents plugin. If it is below 3.0.3, the system is vulnerable. Use WordPress admin panel or run: wp plugin list | grep joli_table_of_contents in the WordPress directory.

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Impact Analysis

If you are a user with Author role or higher on a WordPress site using this plugin before version 3.0.3, an attacker could inject malicious scripts into posts. When other users view these posts, the scripts could steal their session cookies, perform actions on their behalf, or redirect them to malicious sites. Even administrators viewing compromised posts could be affected.

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Compliance Impact

This vulnerability could lead to unauthorized access to user data, which may violate GDPR's data protection requirements or HIPAA's privacy rules. If exploited, it could result in data breaches, unauthorized data access, or loss of user trust, potentially leading to regulatory penalties or legal consequences.

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Mitigation Strategies

Update the Joli Table Of Contents plugin to version 3.0.3 or later immediately. If updating is not possible, consider disabling the plugin until an update is applied to prevent exploitation.

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