Executive Summary

The Quiz Maker plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in its `vc_quizmaker` shortcode in all versions up to and including 6.7.1.7. This vulnerability arises because the plugin does not properly sanitize or escape user-supplied attributes. As a result, authenticated users with contributor-level access or higher can inject malicious web scripts into pages. These scripts will execute whenever any user accesses the affected page.

This vulnerability specifically requires the WPBakery Page Builder plugin to be installed and active, as the shortcode is integrated with WPBakery through a custom element.

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Impact Analysis

An attacker with contributor-level access or higher can exploit this vulnerability to inject arbitrary scripts into pages. These scripts can execute in the context of other users visiting the infected pages, potentially leading to theft of user credentials, session hijacking, defacement, or distribution of malware.

Because the vulnerability allows for stored XSS, the malicious code persists on the site and affects all users who view the compromised content.

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Compliance Impact

I don't know

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Detection Guidance

I don't know

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Mitigation Strategies

To mitigate this vulnerability, you should update the Quiz Maker plugin for WordPress to a version later than 6.7.1.7 where the issue is fixed.

Additionally, ensure that WPBakery Page Builder is either disabled or removed if it is not required, as the vulnerability requires WPBakery Page Builder to be installed and active.

Limit contributor-level access and above to trusted users only, since the vulnerability requires authenticated users with contributor-level access or higher to exploit.

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