Keep every plugin updated. Use a plugin like PluginChecker to scan for known CVE vulnerabilities.
When a server is actually "hacked," it is rarely through a "no password" tool. Instead, attackers use more sophisticated methods: force op no password
In Minecraft terminology, "OP" stands for Operator. Operators have the power to run almost any command, including banning players, changing game modes, and stopping the server. "Force OP" refers to the act of gaining these privileges through exploits, backdoors, or third-party software rather than being added to the server's official "ops.json" file by an administrator. The Myth of the "No Password" Tool Keep every plugin updated