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If you are here because of a message in your minecraft server console, this wasn't us and is a harassment campaign from a griefing group.
Your server is not hacked they are just sending messages in your chat from the dynmap plugin/mod.
To fix this open the dynmap config and change the allowchat setting to false like this:
- class: org.dynmap.SimpleWebChatComponent
allowchat: false
# If true, web UI users can supply name for chat using 'playername' URL parameter. 'trustclientname' must also be set true.
allowurlname: false