Stored XSS in FluentForm WordPress Plugin

Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the WP ManageNinja LLC FluentForm plugin. It allows attackers to inject malicious scripts into web pages generated by the plugin. The vulnerability exists in versions up to 6.2.14 and is caused by improper neutralization of user input during web page generation.

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Detection Guidance

Detecting this vulnerability requires checking the installed version of the FluentForm plugin. Use WordPress admin dashboard to view plugin versions or run SQL queries on the database to check the plugin version in the wp_options table. Alternatively, use WP-CLI commands like 'wp plugin list' to list installed plugins and their versions.

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Impact Analysis

Attackers could exploit this to inject malicious scripts that steal visitor data or hijack accounts. Exploitation requires user interaction, such as clicking a malicious link or submitting a form. Typically, a privileged user role like Contributor or higher is needed for exploitation.

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Compliance Impact

This vulnerability could lead to unauthorized data access or modification, potentially violating GDPR or HIPAA if sensitive user data is exposed. Attackers may inject scripts to steal visitor data, which could include personally identifiable information (PII) or protected health information (PHI).

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Mitigation Strategies

Immediately update the FluentForm plugin to version 6.2.15 or later. Enable auto-updates for vulnerable plugins if using Patchstack. Remove or restrict user roles with Contributor or higher privileges to reduce attack surface until the update is applied.

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