A free & open source anti exploit plugin for your Spigot/Paper-powered Minecraft server.
CopperAX targets the latest version of Minecraft (1.21.11 at the time of writing this), although older versions have been tested on a production server and showed satisfying results (tested versions include 1.8.8 & 1.12.2). Hybrid server softwares are not supported. Paper forks such as Pufferfish, Leaf and Purpur are fully supported and have been widely tested.
CopperAX has been running on a few production servers for quite some time and has been closed source since its first release. I felt like open sourcing it due to my loss of interest into managing Minecraft servers and due to Mojang fixing more and more exploits with newer Minecraft versions being released.
CopperAX is extremely simple to setup. Just drag the .JAR file from the releases tab to your plugins folder and you're good to go! Please do remember that CopperAX comes with absolutely 0 warranty & responsibility from the author.
Exploits patched by CopperAX include (but are not limited to) trapdoor crashes, lectern crashes, book crashes, spam crashes, sign crashes, end gateway crashes, inventory exploits, location exploits, console exploits, portal exploits, dupe exploits, vehicle exploits, beehive crashes and more.
Feel free to open an issue for any question, suggestion or any actual issue that you might be facing with CopperAX. Pull requests are highly appreciated as long as they're widely tested.
Copyright (C) 2026 DottoXD
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.