Bug Of Joomla, Be Careful With Joomla Component

Be careful always to users of joomla CMS, do not arbitrarily install the plugin. 
joomla plugin is easy and the purpose of making it for your viewing pleasure. 
But all of the convenience offered by the plugin, can be transformed instantly into a disaster,  no longer make it easier but instead even bother. I give an example of a plugin with the name "mdigg"  in joomla plugin can generate a bug sql in your CMS.  Because this plugin produces a parameter that allows the attacker to act guessing your  table and column through the address bar that appears in the browser

ttp://samplecmsjoomla.com/?act=story_lists&task=item&link_id=1'

So when you know this information, just take care with your CMS, and always backup your database. When you get hacked you can take back your content from backup file