Lately I've noticed a lot of errors logged by my silverstripe sites regarding database connections. That in itself is a separate issue, but the strange thing about them is the reported URLs. All of the URLs are formatted for Joomla websites, like this:
http://mysite.com/index.php?option=com_community&view=frontpage
http://othersite.com/index.php?nn_qp=1&url=http://www.nonumber.nl/

It's as though some sort of spambot is attacking Silverstripe websites in the mistaken belief that they are Joomla websites. Has anyone else noticed this behaviour? Should we be concerned?

Not exactly anything to do with SilverStripe, rather, just what happens if you have an indexed site anywhere.
All of my websites get constant "attacks" like this, regardless of whether they're SilverStripe.

Not anything to worry about though! You should probably take a look at the errors though, as in general, users should not be able to cause database errors to be triggered. Because they're aimed at Joomla though, you have almost no chance of actually having anything 'bad' happen from these kinds of requests.

Sounds to me like script kiddies or just some bots. I get a lot of these types of requests on my server as well.

Most of the ones I get are looking for PhpMyAdmin or Wordpress urls, but it is the same pricipal.

Cheers,

Mo