Stored Cross-Site Scripting (XSS) in OpenProject

OpenProject is the leading open source project management software. OpenProject utilizes tablesorter inside of the Cost Report feature. This dependency, when misconfigured, can lead to Stored XSS via {icon} substitution in table header values. This attack requires the permissions "Edit work packages" as well as "Add attachments". A project admin could attempt to escalate their privileges by sending this XSS to a System Admin. Otherwise, if a full System Admin is required, then this attack is significantly less impactful. By utilizing a ticket's attachment, you can store javascript in the application itself and bypass the application's CSP policy to achieve Stored XSS. This vulnerability has been patched in version(s) 14.1.0, 14.0.2 and 13.4.2.