Vaadin 7.7.6 Cross Site Scripting

Vaadin version 7.7.6 suffers from a cross site scripting vulnerability.

MD5 | a18a2b3a6b79a8e884de918c1aca80f0

first time poster, so I'm not sure if this is the best venue, format, etc.

using vaadin 7.7.6
using example
but with malicious text that assumes humans are adding the planet names
via a form.

// List of planets
List<Planet> planets = new ArrayList<>();
planets.add(new Planet(1, "<iframe width="560" height="315"
frameborder="0" allowfullscreen></iframe>"));

ComboBox<Planet> select =
new ComboBox<>("Select or Add a Planet");
select.setDescription(""); // doesn't do anything

the combobox will render this as <div
onmouseenter="alert('hello')">:Goog</div> but the description (tooltip)
will actually render the html and thus allow you to exploit the system. If
you encode it first converting < to < then the list itself will have the
ugly < which isn't what you want to show for <E> Corp (Mr. Robot :D).
The best way to fix this issue is to have an ItemDescriptionGenerator to
allow a separate tooltip to be generated from the contents of the list.

I've determined this bug is still relevant in 7.7.9.

Outside of reminding them, I'm trying to determine the best next steps,
whether this should get a CVE, how to go about doing that in spite of
upstream ignoring it, whether this is even the appropriate venue to talk
about such things. Maybe this shouldn't even be considered a vulnerability,
feedback welcome.
Caleb Cushing

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