Executive Summary

The Webling plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in all versions up to and including 3.9.0. This vulnerability arises because the plugin does not properly sanitize input, escape output, or check user capabilities in certain functions ('webling_admin_save_form' and 'webling_admin_save_memberlist').

As a result, authenticated users with Subscriber-level access or higher can inject malicious web scripts into Webling forms and memberlists. These scripts execute whenever an administrator views the affected form or memberlist in the WordPress admin area.

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Impact Analysis

This vulnerability allows attackers with low-level authenticated access to inject malicious scripts that execute in the context of an administrator's browser. This can lead to unauthorized actions such as stealing administrator credentials, hijacking sessions, or performing administrative functions without permission.

Because the attack requires only Subscriber-level access, it lowers the barrier for exploitation and can compromise the security and integrity of the WordPress site.

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