cmendla - 1:35 pm on Aug 17, 2013 (gmt 0)
@OP - is the original stuff link spam or is it attempted SQL injection? The poison null looks deceptively innocent..
I've been running one of the firewall extensions for joomla. That seems to stop a lot of the sql injection attempts on the forms. THey now have a 'basic' setting that reduces false positives but still stops a lot of the garbage.