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Hackers exploit BleedingPipe RCE to target Minecraft servers, players
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
Bear in mind these are very old versions of minecraft. Mods on these versions are still somewhat popular in a dedicated group, but these won't be a problem for a typical minecraft player.
That said, EnderIO in 1.12 is probably still fairly popular. It would be a good idea for server admins and players who use that mod in particular to look into this.