Cryptocat WIDE OPEN, new version a must
In case you’re using an older variant of Cryptocat, you are advised to update your installation immediately.
Crypto expert Steve Thomas claims to have identified a vulnerability that exposes all Cryptocat chats from the period between October 17, 2011, and June 15, 2013. He has even developed a tool, DecryptoCat, to demonstrate his point.
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Story added 5. July 2013, content source with full text you can find at link above.