What’s New in Windows 10 Cumulative Update KB4503293 for Version 1903

Microsoft has released the second cumulative update for Windows 10 version 1903, or the May 2019 Update, but this time the focus is specifically on security improvements.

Cumulative update KB4503293 increases the OS build number to 18362.175. The previous update was published on May 29 as KB4497935 and it included only non-security fixes.

As it typically happens on a Patch Tuesday, the update resolves security bugs in Windows 10 and the other built-in components, like browsers (both Internet Explorer and Microsoft Edge receive updates this month), Windows Media, Windows Shell, Windows Authentication, and the Microsoft Scripting Engine.

Additionally, Microsoft resolves an issue affecting the connections established between Windows and Bluetooth devices. The company explains the following in the release notes of the update:

“Addresses a security vulnerability by intentionally preventing connections between Windows and Bluetooth devices that are not secure and use well-known keys to encrypt connections, including security fobs. If BTHUSB Event 22 in the Event Viewer states, “Your Bluetooth device attempted to establish a debug connection….”, then your system is affected. Contact your Bluetooth device manufacturer to determine if a device update exists. For more information, see CVE-2019-2102 and KB4507623.”

One known issue

The update comes with just one known issue that breaks down Windows Sandbox. Introduced in Windows 10 May 2019 Update, Windows Sandbox is a feature that allows users to run apps in a secure environment, much like a traditional virtual machine.

After installing cumulative update KB4503293, launching Windows Sandbox could fail with error “ERROR_FILE_NOT_FOUND (0x80070002)” if the language is changed during the update process.

The software giant says it’s already working on a workaround, and it should be shipped in a future cumulative update.

There are no reports of failed installs so far, so KB4503293 likely brings a flawless experience to the majority of Windows 10 May 2019 Update users.

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