BaseFortify

Executive Summary

This is an Unauthenticated Cross Site Scripting (XSS) vulnerability in the Form Block WordPress plugin versions 1.8.1 and below. It allows attackers to inject malicious scripts into websites without authentication. The vulnerability is classified as medium severity with a CVSS score of 7.1.

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Detection Guidance

To detect this XSS vulnerability in the Form Block plugin, check the installed version of the plugin on your WordPress site. If it is version 1.8.1 or below, the system is vulnerable. You can verify the version via the WordPress admin panel under Plugins or by inspecting the plugin files on the server.

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Impact Analysis

Attackers can steal visitor data or hijack accounts by injecting malicious scripts. Users may unknowingly trigger the attack by clicking a malicious link or submitting a form. The vulnerability requires a privileged user action but can lead to significant security breaches.

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Compliance Impact

This XSS vulnerability could expose websites to data theft or account hijacking, which may lead to unauthorized access to personal or sensitive data. Such incidents could violate GDPR (if EU user data is involved) or HIPAA (if healthcare data is compromised), potentially resulting in legal penalties or compliance failures.

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Mitigation Strategies

Immediately update the Form Block plugin to version 1.8.2 or later. If updating is not possible, apply Patchstack's mitigation rule to block attacks until the update is completed. Remove any untrusted user access temporarily and monitor for suspicious activity.

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