As of 10:53pm Eatern time U.S. I went to visit http://www.joomlaif.com A place where I get some of my nice Joomla components and found a message from a Turkish Hacking Crew. Does anyone else here use Joomlaif.com for components?
I'm sure they will repair this issue soon, so it may not be there when some of you go to look!
I noticed something very alarming... I decided to paste into Google the message found on JoomlaIF's website. The message was from the hackers, it read: AYYILDIZ DELTA SALDIRI TIMI
If you put that into Google you will see many Joomla sites that this crew has hacked, I wonder what kind of flaw this group is exploiting. I believe in giving the proper credit to Joomla or any developer for that matter, when it comes to copyrights, but maybe the powered by Joomla! is leaving an open door for groups like this to seek people out and target Joomla sites!
It's a calendar exploit. The calendar was long forgotten by the original developer and no one at Joomla picked it up to continue with it and update it / patch it.
They have now.
There are some work arounds and they are preparing to relase an update to close this little problem shortly.