MrExcel Data Breach (2016)

MrExcel.com detected a hack in progress on its forum in December 2016, and promptly shut it down. While initially believing no user data had been compromised, evidence emerged around January 8, 2017, indicating that some user information, including user IDs, email addresses, and hashed passwords, had been accessed and posted online. The information was removed later that month. Users who had accounts on the MrExcel Message Board on or before December 6, 2016, were affected.