MT-Cumulus / MT 4 Cross Site Scripting

`Hello list!  
  
I want to warn you about Cross-Site Scripting vulnerability in plugin  
MT-Cumulus for Movable Type.  
  
-------------------------  
Affected products:  
-------------------------  
  
At first the developer made widget Flash Tag Cloud For MT 4, and later made   
full-fledged plugin MT-Cumulus for Movable Type. And in both applications   
there is this XSS vulnerability.  
  
Vulnerable are widget Flash Tag Cloud For MT 4 and plugin MT-Cumulus v1.02   
and previous versions.  
  
----------  
Details:  
----------  
  
This XSS is similar to XSS vulnerability in WP-Cumulus, because it's using  
tagcloud.swf made by author of WP-Cumulus. About such vulnerabilities I  
wrote in 2009-2011, particularly about millions of flash files tagcloud.swf  
which are vulnerable to XSS attacks I mentioned in my article XSS  
vulnerabilities in 34 millions flash files  
(http://lists.webappsec.org/pipermail/websecurity_lists.webappsec.org/2010-January/006033.html).  
  
XSS (WASC-08):  
  
For Flash Tag Cloud For MT 4:  
  
http://site/scripts/tagcloud.swf?mode=tags&tagcloud=%3Ctags%3E%3Ca+href='javascript:alert(document.cookie)'+style='font-size:+40pt'%3EClick%20me%3C/a%3E%3C/tags%3E  
  
For MT-Cumulus:  
  
http://site/mt/mt-static/plugins/Cumulus/tagcloud.swf?mode=tags&tagcloud=%3Ctags%3E%3Ca+href='javascript:alert(document.cookie)'+style='font-size:+40pt'%3EClick%20me%3C/a%3E%3C/tags%3E  
  
Code will execute after click. It's strictly social XSS. Also it's possible  
to conduct (like in WP-Cumulus) HTML Injection attack.  
  
------------  
Timeline:  
------------  
  
2011.05.11 - disclosed at my site.  
2011.05.12 - informed developer of these widget and plugin.  
  
I mentioned about this vulnerability at my site  
(http://websecurity.com.ua/5139/).  
  
Best wishes & regards,  
MustLive  
Administrator of Websecurity web site  
http://websecurity.com.ua   
  
`