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Test your applicationsUpgrade de.gurkenlabs:litiengine
to version 0.5.1 or higher.
de.gurkenlabs:litiengine is a pure 2D free java game engine. Written in plain Java 8 it provides all the infrastructure to create a 2D tile based java game, be it a platformer or a top-down adventure.
Affected versions of this package are vulnerable to Insecure Randomness. The client IDs in ClientConnection are sequential. This easily allows an attacker to spoof another player's ID.