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Yes, this is a complete non-event, probably a radiation artifact in the sensor. The following photos were taken at the same time by the left and right navigation camera, respectively, and only the latter shows the bright spot.

http://mars.jpl.nasa.gov/msl/multimedia/raw/?rawid=NLB_44979...

http://mars.jpl.nasa.gov/msl/multimedia/raw/?rawid=NRB_44979...

Images digged up by redditor CurtisLeow at http://www.reddit.com/r/space/comments/22g13b/rover_captures...

Yea, I wouldn't call "Scott C. Waring, who maintains the website UFO Sightings Daily" a reliable source. Just look at that site. I'll give you some of the headlines...

Giant UFO Near Earth In Photo Released by Brazil Planetarium, March 2014

Alien Saves Mans Life In China Car Accident, Sept 2012

Updated: Alien Face Discovered By Mars Rover Feb 2014

Yes, smells more of a cosmic ray hitting the sensor. They're quite a bit more common on Mars.

Also, from what I read this was first noticed on a website called "UFO Sightings Daily". NASA isn't giving it any thought because there's nothing to think about.