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Vulnerability in widget Cumulus for BlogEngine.NET

Hello Bugtraq!

I want to warn you about security vulnerability in widget Cumulus for

Advisory: Vulnerability in widget Cumulus for BlogEngine.NET
URL: http://websecurity.com.ua/4184/
Affected product: all versions of Cumulus for BlogEngine.NET.

30.04.2010 - found vulnerability.
10.05.2010 - disclosed at my site.
11.05.2010 - informed developers.

This is Cross-Site Scripting vulnerability.

This XSS is similar to XSS vulnerability in WP-Cumulus and other web
applications which I already reported to security mailing lists, because
it's using tagcloud.swf made by author of WP-Cumulus. 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



Code will execute after click. It's strictly social XSS.

Also it's possible to conduct (like in WP-Cumulus) HTML Injection attack,
including in those flash files which have protection (in flash files or via
WAF) against javascript and vbscript URI in parameter tagcloud.

HTML Injection:


Best wishes & regards,
Administrator of Websecurity web site