MyBB Like Plugin Cross-Site Scripting Vulnerability

A cross-site scripting (XSS) vulnerability has been identified in the MyBB Like Plugin version 3.0.0. This issue allows attackers to inject malicious scripts by creating posts or threads with unvalidated subject content. The injected scripts execute when other users view the attacker's profile, where liked posts are displayed without proper sanitization.

Impact

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

Reproduction

To reproduce this vulnerability, create a post or thread with a subject containing script tags, such as a JavaScript alert. Once the post is liked by another user, visit the profile of the user who liked the post. The injected script will execute, demonstrating the cross-site scripting vulnerability.