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Microsoft warns of security vulnerability in Minecraft Java

Users must update now to secure their game.

Microsoft has urged all Minecraft Java owners to update their game now to avoid a nasty security vulnerability.

The issue allows for remote code execution on Minecraft servers by pasting messages into a chat box, and was flagged online by tech security analysts last Friday. Eurogamer contacted Microsoft at the time.

On Sunday, Microsoft responded with a blog post on the Minecraft blog, and told all Java users to update their games immediately.

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For most, this will be as simple as restarting their games to get the new update - but those on modified clients and third-party launchers may need to do more. There's more details on the Minecraft blog.

"Player safety is the top priority for us," Microsoft wrote in a tweet from the official Minecraft account. "Unfortunately, earlier today we identified a security vulnerability in Minecraft: Java Edition.

"The issue is patched, but please follow these steps to secure your game client and/or servers. Please RT to amplify."

There's no known issue associated with the Bedrock version of the Minecraft available for Windows 10 and 11, as well as consoles.

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