Executive Summary

The HT Contact Form – Drag & Drop Form Builder for WordPress plugin is vulnerable to Stored Cross-Site Scripting (XSS) via the 'file_upload' parameter in all versions up to and including 2.8.2.

This vulnerability exists because the plugin does not properly sanitize input or escape output, allowing unauthenticated attackers to inject arbitrary web scripts.

These injected scripts execute whenever a user accesses a page containing the malicious content.

Exploitation requires the 'Store Submissions' setting to be enabled, which causes unsanitized field values to be saved in the database and rendered unsafely in the admin entry viewer.

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Impact Analysis

This vulnerability can allow attackers to execute arbitrary scripts in the context of the affected website.

Such script execution can lead to theft of sensitive information, session hijacking, defacement, or other malicious actions performed on behalf of users who view the injected content.

Because the attack can be performed by unauthenticated users and affects administrative interfaces, it poses a significant security risk.

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Mitigation Strategies

To mitigate this vulnerability, you should disable the 'Store Submissions' setting in the HT Contact Form – Drag & Drop Form Builder plugin for WordPress. This setting controls whether unsanitized field values are saved to the database and rendered in the admin entry viewer, which is the vector for the stored cross-site scripting attack.

Additionally, updating the plugin to a version later than 2.8.2, once available, would be recommended to ensure the vulnerability is patched.

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