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A very serious security vulnerability has just been found in all versions of Pligg, the most popular way to "build your own Digg". The vulnerability allows a complete site takeover by a malicious hacker - if you are using Pligg, it's critical that you make use of the fix immediately.
Luckily for all you Pligg admins, a patch is already available. You can get it here, and discussions are ongoing in the Pligg forums.