A hacker stole the credit card details of over 800 members of the IEEE (Institute of Electrical and Electronics Engineers) last December, according to its law firm.
The Hacker News
A team of IEEE-appointed forensic investigators "concluded that a file containing customer credit card information had been deleted on or about November 17, 2010", the institute's law firm told the Attorney General of New Hampshire in February [pdf].

The forensic team believed that 828 members' credit card numbers, associated names, expiration dates and security numbers may have been accessed. It discovered "certain vulnerabilities in the system", but the IEEE had no proof that the exposed credit cards had been used to make fraudulant transactions, according to the letter.

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