Windows 10 Source Code Leaked Online: Report

Screenshot of a Beta Archives posting

In a surprising development, Microsoft’s internal Windows 10 builds and Windows 10 source code components have been reportedly leaked and uploaded to Beta Archive. A report from The Register claims that the whole data was 32TB in size. Following this,

Beta Archive has removed the alleged contents from its forums and FTP servers.
According to a report from The Register, a huge chunk of Microsoft’s code was leaked and uploaded on BetaArchive. This trunk of code contained Microsoft’s internal operating system builds and source code for Windows 10. The leak is being described as bigger than Windows 2000 code leak in 2004.

The leaked data had around 32TB of official and non-public Windows installation images and software, which were compressed down to 8TB. The Register, whose journalist spotted the builds, believes that the data was leaked from Microsoft’s internal systems around March.

The leak appears to consist of a lot of Windows 10 Redstone 2 builds. Specifically, the leaked code contains Redmond’s Share Source Kit, which includes the base Windows 10 drivers source, PnP code, ARM-specific OneCore kernel code, USB and WiFi stacks, storage drivers, etc.

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Windows 10 leak: Beta Archive has removed the private MS files from its FTP. Here’s examples of non-public stuff that was dumped online

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Apart from this, the leaked and top secret builds of Windows 10 were created by engineers for testing and bug-hunting purposes, which included private debugging symbols.

Using the above-mentioned leaked data, one can look for vulnerabilities as the code runs at the most trusted levels of Windows OS.

What does Beta Archive have to say?

As expected, Beta Archive has taken steps to remove the leaked files from their forums and FTP servers. In a statement, they also claimed that the builds came from different sources, not a single leak. “The folder itself was 1.2GB in size, contained 12 releases each being 100MB. This is far from the claimed “32TB” as stated in The Register’s article, and cannot possibly cover “core source code” as it would be simply too small, not to mention it is against our rules to store such data,” they further added.

You can read Beta Archive’s complete statement here. We’ve contacted Microsoft for a statement on the same, and we’ll be updating this article when we’ll hear something back.