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BankInfoSecurity May 5, 2021 Twitter Get Permission It has been an open question as to how a half-dozen hacking groups began exploiting Exchange servers in an automated fashion in the days leading up to Microsoft s patches. But there are strong signs that exploit code leaked, and the question now is: Who leaked it? A Taiwanese computer security researcher indicated on Friday that exploit code he developed and privately shared with Microsoft in early January ended up in hostile hands. It s an unsatisfactory prospect that how the Exchange exploit leak occurred may never be solved. But it may direct questions back to Microsoft as to whether the MAPP is still worth it. 

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