otrs -- XSS vulnerability could lead to remote code execution

The OTRS Project reports:

This advisory covers vulnerabilities discovered in the OTRS core
system. This is a variance of the XSS vulnerability, where an attacker
could send a specially prepared HTML email to OTRS which would cause
JavaScript code to be executed in your browser while displaying the
email. In this case this is achieved by using javascript source
attributes with whitespaces.
Affected by this vulnerability are all releases of OTRS 2.4.x up to
and including 2.4.14, 3.0.x up to and including 3.0.16 and 3.1.x up to
and including 3.1.10.