Flashaholics are not generally concerned with bugs and security flaws. They just flash and ask questions later. Apparently there had been a small bug in the CyanogenMod code that was logging screen unlock patterns that were created by users. This was strictly accidental on the part of CM, besides what in the world would they do with thousands of screen unlock patterns? You would not only need the pattern, you would need the phone since that is where the log was stored for this to cause a real security risk. I personally don't use an unlock pattern although I do admit it would probably be a good idea. I guess I am just to lazy to spend a second or two unlocking my phone.
If this security bug affected you no worries it was fixed today.
Grab the latest build of CM for your device here