Stored XSS in BuddyHolis TableSearch WordPress Plugin

Executive Summary

The BuddyHolis TableSearch plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in the ‘placeholder’ parameter in all versions up to and including 1.1.0.

This vulnerability exists because the plugin does not properly sanitize input or escape output, allowing authenticated users with Contributor-level access or higher to inject malicious web scripts.

These injected scripts execute whenever any user accesses the affected page, potentially compromising user security.

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Detection Guidance

This vulnerability involves Stored Cross-Site Scripting (XSS) via the 'placeholder' parameter in the BuddyHolis TableSearch WordPress plugin up to version 1.1.0. Detection typically involves identifying injected scripts in the 'placeholder' parameter on pages generated by the plugin.

To detect this vulnerability on your system, you can search the WordPress database for suspicious or unexpected script tags or JavaScript code stored in the 'placeholder' fields related to the BuddyHolis TableSearch plugin.

• Use SQL queries on the WordPress database to find suspicious entries, for example: SELECT * FROM wp_options WHERE option_name LIKE '%tablesearch%' AND option_value LIKE '%<script>%';
• Check the plugin files and pages rendered by the plugin for injected scripts in the placeholder attribute by inspecting the HTML source code in a browser or using command line tools like curl or wget.
• Use web vulnerability scanners or XSS detection tools targeting authenticated Contributor-level access to test if arbitrary scripts can be injected and executed via the placeholder parameter.

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Impact Analysis

This vulnerability can allow attackers with Contributor-level access or above to inject malicious scripts into web pages.

When other users visit these pages, the malicious scripts execute in their browsers, which can lead to theft of sensitive information, session hijacking, or other malicious actions.

The CVSS score of 6.4 indicates a medium severity impact, with potential confidentiality and integrity loss but no direct impact on availability.

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Mitigation Strategies

To mitigate this vulnerability, you should update the BuddyHolis TableSearch plugin to a version later than 1.1.0 where the issue is fixed.

Additionally, restrict Contributor-level access to trusted users only, as the vulnerability requires authenticated users with Contributor-level access or higher to exploit.

Implement input sanitization and output escaping measures if you maintain the plugin or custom code to prevent stored cross-site scripting.

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