Comment 2 for bug 279518

This could have something to do with it. This is the last entry in ITP #326398 dated 29 Nov 2008

"This ITP bug is over 3 years old, there are obvious licensing issues and it is
a security nightmare. I am closing this for now, please only reopen, if the
license issues are resolved, packages are prepared and security issues are
taken care of and will be taken care of in the future :)"

It seems Joomla has some licensing and security issues.