GD bbPress Attachments <= 2.5 - Authenticated Stored XSS

Description

An authenticated user of a bbPress forum, who can attach a file, can inject arbitrary JavaScript code via the image filename. The arbitrary code runs both on the topic page and in the admin panel, and it only affects the administrators, moderators and the attacker.

The variable $error[‘file’] in /code/attachments/front.php (line 349) is not escaped.