Simple Link Directory Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the Simple Link Directory plugin for WordPress, affecting all versions through 8.9.2. The issue arises from inadequate input sanitization and output escaping on user-supplied attributes, such as 'title_font_size', within the 'qcopd-directory' shortcode. This vulnerability allows authenticated attackers with contributor-level access or higher to inject arbitrary web scripts into pages, which are executed when users access the injected content.

Impact

Exploitation of this vulnerability allows for stored cross-site scripting, where injected scripts are executed in the context of the user viewing the page.

Reproduction

To reproduce this vulnerability, an authenticated user with contributor-level access or higher can use the 'qcopd-directory' shortcode and include a payload in the 'title_font_size' attribute. Once the shortcode is processed, the injected script will execute when the page is viewed.

Remediation

Users are advised to update the Simple Link Directory plugin to version 8.9.4 or a newer patched version.