WordPress Featured Image from URL Plugin Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the Featured Image from URL (FIFU) plugin for WordPress, affecting all versions through 5.2.7. The issue arises from inadequate input sanitization and output escaping in the Featured Image custom fields. This vulnerability allows authenticated attackers with Contributor-level access and above to inject arbitrary scripts into pages, which are executed when users access the affected pages.

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 inject scripts into the Featured Image custom fields of a post. Once the scripts are injected, they will be executed when the post is viewed by any user.

Remediation

Users are advised to update the Featured Image from URL plugin to version 5.2.8 or later.