The source code for Windows XP SP1 and other versions of the operating system was allegedly leaked online today. The leaker claims to have spent the last two months compiling a collection of leaked Microsoft source code. This 43GB collection was then released today as a torrent on the 4chan forum. Microsoft has not confirmed if the source code is the actual Windows XP or Windows Server 2003. The leak could be a potential security risk, but the risks are likely low, and for most people, this leak will just let them get a peek into Windows history.
Source: https://www.bleepingcomputer.com/news/microsoft/the-windows-xp-source-code-was-allegedly-leaked-online/