Unauthenticated XSS in Easy Form Builder

Executive Summary

This is an unauthenticated Cross Site Scripting (XSS) vulnerability in the Easy Form Builder WordPress plugin versions 4.0.12 and below. It allows attackers to inject malicious scripts into web pages viewed by users without needing to authenticate.

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Detection Guidance

Detecting this XSS vulnerability requires checking if the Easy Form Builder plugin version 4.0.12 or below is installed. Inspect WordPress plugin files for suspicious scripts in form inputs or outputs. Use commands like 'grep -r "easy_form_builder" /var/www/html/' to locate plugin files. Monitor web server logs for unusual user interactions or script injections.

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Impact Analysis

Attackers could inject malicious scripts that execute when visitors access the site. This could lead to redirects, display of unwanted advertisements, or theft of user session cookies. Successful exploitation requires user interaction like clicking a malicious link.

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Mitigation Strategies

Immediately update the Easy Form Builder plugin to version 4.0.13 or later. If updating is not possible, apply Patchstack's mitigation rule to block attacks until the update is applied. Remove or disable the plugin if no update is available. Review and sanitize all user inputs in forms to prevent script injection.

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