Windows 10 users could potentially be faced with more security problems as the source code behind the Microsoft operating system accidentally got leaked online.

The code contained files related to USB storage and Wi-Fi and was on a site called Beta Archive. This website keeps track of Windows releases and often contains archived builds of the OS. Such code is only shared with Microsoft’s most trusted partners and customers.

It was originally thought that 32TB of data had been leaked onto the site. But in a statement to The Verge, Microsoft said that “just 1.2GB” was posted online.

“Our review confirms that these files are actually a portion of the source code from the Shared Source Initiative and is used by OEMs and partners,” said a spokesperson.

Since then, Beta Archive voluntarily pulled the code which contained details on Windows 10’s USB, storage, Wi-Fi drivers and ARM-specific OneCore kernel code. It also contains versions of the Windows 10 Mobile Adaptation Kit, which is used to build system images for Windows on phones.

The code also featured private debugging symbols, which developers use to see what functions and data are being used by certain code. Such symbols are removed from the OS before being released to the public.

An administrator on Beta Archive said in a forum posting that he didn’t believe there was any connection between this incident and the arrest of two British men following an alleged hack of networks belonging to Microsoft.

The source of the leak is unknown at present, but raises concerns over security of the operating system and how such code is stored.

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