Server Security Plugins · Security Plugin · by GrimAnticheat
An open source predictive anticheat for Minecraft servers that simulates player movement to detect cheating clients.
Paper · Spigot · Purpur · +3MC 26.2
Folia support · Open source
Security Plugin
An authentication plugin that adds registration and login with passwords for servers that cannot use Mojang's online mode.
AuthMeReloaded is a Minecraft security plugin for Paper, Spigot, Velocity, BungeeCord, Folia and Bukkit, listed under Server Security Plugins. It lists support for Minecraft 26.3 and 26.2. It is free.
From the source listing
AuthMeReloaded requires players to register and log in, which protects names on servers running offline mode or behind a proxy. It runs on Paper, Spigot, Folia and the Velocity and BungeeCord proxies and is published under the GPL with a wiki. It does not replace online mode where that is available.
From the source listing
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Server Security Plugins · Security Plugin · by GrimAnticheat
An open source predictive anticheat for Minecraft servers that simulates player movement to detect cheating clients.
Paper · Spigot · Purpur · +3MC 26.2
Folia support · Open source
Guides
Twenty checks that close the most common ways servers are taken over: accounts, ports, proxies, panels, plugins and backups.