TweetDeck Impacted by XSS Flaw
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The first signs of trouble with TweetDeck appeared around 11 a.m. ET with warnings of a possible cross-site scripting (XSS) attack.
In an XSS attack, code from one location is able to influence another site without authorization. In my own personal usage, I first began seeing Twitter messages with embedded XSS code shortly after 11 a.m. ET, which upon viewing were immediately retweeted automatically, without my authorization or any action on my part.