Executive Summary

The vulnerability exists in the Master Addons For Elementor WordPress plugin, specifically in versions up to and including 3.1.0. It is a Stored Cross-Site Scripting (XSS) flaw that occurs via the 'jtlma_custom_js' Page Setting (Custom JS Extension). This happens because the plugin does not properly sanitize input or escape output. Authenticated users with author-level access or higher can inject arbitrary JavaScript code into pages. This injected script executes whenever any user accesses the affected page.

The vulnerability is worsened by the fact that the usual capability check (unfiltered_html) is only enforced during the UI rendering of Elementor controls, not during the save process. This allows attackers to bypass UI restrictions by sending crafted POST requests directly to admin-ajax.php, enabling injection without using the UI.

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Impact Analysis

This vulnerability can allow an attacker with author-level access to inject malicious JavaScript code into WordPress pages. When other users visit these pages, the malicious scripts will execute in their browsers. This can lead to theft of user credentials, session hijacking, defacement, or distribution of malware.

Because the attack requires author-level access, it may be limited to environments where such users exist or where accounts have been compromised. However, the impact on confidentiality and integrity is significant, as indicated by the CVSS score of 6.4 with low attack complexity but requiring privileges.

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